Loans Recorded investment by loan grade (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		$ 7,198,438
Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		103,370
Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		139
Impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		108,499
Purchased credit impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		10,422
Pass [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		3,906,691
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		1,595,517
Commercial Financial And Agricultural [Member] \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		14,638
Commercial Financial And Agricultural [Member] \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		0
Commercial Financial And Agricultural [Member] \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		28,880
Commercial Financial And Agricultural [Member] \| Purchased credit impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		337
Commercial Financial And Agricultural [Member] \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		1,551,662
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		1,754,206
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 381,151
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	454,564
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	298,136
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	175,364
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	125,882
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	350,359
Financing Receivable, Excluding Accrued Interest, Revolving	16,336
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,801,792
Commercial Real Estate Portfolio Segment [Member] \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		87,439
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	786
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,206
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	32,965
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	9,354
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4,297
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	17,829
Financing Receivable, Excluding Accrued Interest, Revolving	996
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	72,433
Commercial Real Estate Portfolio Segment [Member] \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		117
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3,897
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,578
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,385
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	11,373
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,967
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	14,541
Financing Receivable, Excluding Accrued Interest, Revolving	450
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	40,191
Commercial Real Estate Portfolio Segment [Member] \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		70,357
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	47
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	618
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	665
Commercial Real Estate Portfolio Segment [Member] \| Purchased credit impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		7,461
Commercial Real Estate Portfolio Segment [Member] \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		1,588,832
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	376,468
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	445,780
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	263,786
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	154,637
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	115,571
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	317,371
Financing Receivable, Excluding Accrued Interest, Revolving	14,890
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,688,503
Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		227,563
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	97,131
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	76,919
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	7,003
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	5,796
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,856
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	3,412
Financing Receivable, Excluding Accrued Interest, Revolving	22,444
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	214,561
Construction Real Estate Remaining Commercial [Member] \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		164
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	202
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	691
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	893
Construction Real Estate Remaining Commercial [Member] \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	52
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	264
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	316
Construction Real Estate Remaining Commercial [Member] \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		3,110
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0
Construction Real Estate Remaining Commercial [Member] \| Purchased credit impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		1,002
Construction Real Estate Remaining Commercial [Member] \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		223,287
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	96,929
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	76,867
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	7,003
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	4,841
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,856
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	3,412
Financing Receivable, Excluding Accrued Interest, Revolving	22,444
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	213,352
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		527,383
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	139,687
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	166,108
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	68,718
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	45,016
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	26,678
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	71,924
Financing Receivable, Excluding Accrued Interest, Revolving	15,671
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	533,802
Residential Real Estate Commercial [Member] \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		798
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	95
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	884
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	106
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	79
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	497
Financing Receivable, Excluding Accrued Interest, Revolving	135
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,796
Residential Real Estate Commercial [Member] \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		22
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	735
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	22
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	691
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	41
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	95
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	993
Financing Receivable, Excluding Accrued Interest, Revolving	29
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,606
Residential Real Estate Commercial [Member] \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		4,557
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	56
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	56
Residential Real Estate Commercial [Member] \| Purchased credit impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		1,510
Residential Real Estate Commercial [Member] \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		520,496
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	138,801
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	165,202
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	67,921
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	44,896
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	26,583
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	70,434
Financing Receivable, Excluding Accrued Interest, Revolving	15,507
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	529,344
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		24,452
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	6,903
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,538
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3,144
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2,257
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	767
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	923
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	20,532
Finance Leases Portfolio Segment [Member] \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		331
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	198
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	111
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	184
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	67
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	21
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	581
Finance Leases Portfolio Segment [Member] \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	698
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	23
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	19
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	78
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	818
Finance Leases Portfolio Segment [Member] \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		1,595
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	332
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	16
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	22
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	370
Finance Leases Portfolio Segment [Member] \| Purchased credit impaired [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		112
Finance Leases Portfolio Segment [Member] \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		22,414
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	6,705
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,729
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2,628
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2,151
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	705
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	845
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	18,763
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		4,129,121
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	963,190
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	919,567
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	479,032
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	282,769
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	193,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	494,470
Financing Receivable, Excluding Accrued Interest, Revolving	536,158
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,868,186
Commercial Portfolio Segment [Member] \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,889
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,793
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	33,684
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	10,250
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4,595
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	18,326
Financing Receivable, Excluding Accrued Interest, Revolving	13,117
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	91,654
Commercial Portfolio Segment [Member] \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4,738
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,256
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2,477
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	13,046
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	6,630
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	23,430
Financing Receivable, Excluding Accrued Interest, Revolving	963
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	55,540
Commercial Portfolio Segment [Member] \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	56
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	30
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	797
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	243
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	532
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	743
Financing Receivable, Excluding Accrued Interest, Revolving	488
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,889
Commercial Portfolio Segment [Member] \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	955,507
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	906,488
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	442,074
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	259,230
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	181,243
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	451,971
Financing Receivable, Excluding Accrued Interest, Revolving	521,590
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,718,103
commercial financial agricultural less PPP and overdraft
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	268,730
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	210,606
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	102,031
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	54,336
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	37,817
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	67,852
Financing Receivable, Excluding Accrued Interest, Revolving	481,707
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,223,079
commercial financial agricultural less PPP and overdraft \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,608
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,592
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	429
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	59
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	277
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	11,986
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	15,951
commercial financial agricultural less PPP and overdraft \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	106
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	906
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	401
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,345
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	549
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7,818
Financing Receivable, Excluding Accrued Interest, Revolving	484
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	11,609
commercial financial agricultural less PPP and overdraft \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	30
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	465
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	227
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	463
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	125
Financing Receivable, Excluding Accrued Interest, Revolving	488
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,798
commercial financial agricultural less PPP and overdraft \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	267,016
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	208,078
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	100,736
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	52,705
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	36,528
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	59,909
Financing Receivable, Excluding Accrued Interest, Revolving	468,749
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,193,721
PPP Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	69,588
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,832
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	74,420
PPP Loans \| Five Rated [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0
PPP Loans \| Six Rated [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0
PPP Loans \| Impaired [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0
PPP Loans \| Pass [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	69,588
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,832
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	74,420
Bank Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,127
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,127
Bank Overdrafts \| Nonperforming Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0
Bank Overdrafts \| Performing Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,127
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,127
consumer less GFSC and check loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	649,879
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	506,061
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	259,985
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	119,621
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	64,854
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	62,729
Financing Receivable, Excluding Accrued Interest, Revolving	22,664
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,685,793
consumer less GFSC and check loans \| Nonperforming Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	241
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	506
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	755
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	399
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	155
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	593
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,649
consumer less GFSC and check loans \| Performing Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	649,638
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	505,555
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	259,230
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	119,222
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	64,699
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	62,136
Financing Receivable, Excluding Accrued Interest, Revolving	22,664
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,683,144
Construction Real Estate Retail
Financing Receivable, Impaired [Line Items]
Loans and Leases Receivable, Recorded Investment		116,665
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	68,374
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	26,894
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	5,767
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2,743
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,505
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,863
Financing Receivable, Excluding Accrued Interest, Revolving	79
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	107,225
Construction Real Estate Retail \| Nonperforming Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	647
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	57
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	21
Financing Receivable, Excluding Accrued Interest, Revolving	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	725
Construction Real Estate Retail \| Performing Financial Instruments [Member]

Loans Recorded investment by loan grade (Details) - USD ($)
$ in Thousands

Dec. 31, 2021

Dec. 31, 2020

Financing Receivable, Impaired [Line Items]

Loans and Leases Receivable, Recorded Investment

$ 7,198,438

Five Rated [Member]

Financing Receivable, Impaired [Line Items]

Loans and Leases Receivable, Recorded Investment

103,370

Six Rated [Member]

Financing Receivable, Impaired [Line Items]