Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Minimum number of days past due for loans to be considered nonperforming	90 days
Credit Quality by Loan Class [Abstract]
2021/2020	$ 1,200,105	$ 1,927,429
2020/2019	1,402,169	1,312,819
2019/2018	1,154,959	949,810
2018/2017	801,247	750,728
2017/2016	628,704	515,688
Prior	1,531,338	1,262,066
Revolving Loans Amortized Cost Basis	715,228	749,657
Revolving Loans Converted to Term	83,877	30,688
Total	7,517,627	7,498,885
C&I [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	180,491	352,323
2020/2019	283,865	195,227
2019/2018	157,352	106,502
2018/2017	86,756	50,153
2017/2016	34,735	35,040
Prior	56,106	39,712
Revolving Loans Amortized Cost Basis	334,434	346,233
Revolving Loans Converted to Term	11,191	426
Total	1,144,930	1,125,616
C&I [Member] | Pass [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	180,367	331,921
2020/2019	267,935	182,329
2019/2018	143,922	91,230
2018/2017	77,622	41,856
2017/2016	28,251	32,625
Prior	48,225	32,609
Revolving Loans Amortized Cost Basis	306,465	322,674
Revolving Loans Converted to Term	10,934	412
Total	1,063,721	1,035,656
C&I [Member] | Special Mention [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	98	20,064
2020/2019	15,548	6,534
2019/2018	5,926	5,053
2018/2017	3,619	4,702
2017/2016	3,547	1,624
Prior	4,057	2,830
Revolving Loans Amortized Cost Basis	20,651	13,614
Revolving Loans Converted to Term	0	0
Total	53,446	54,421
C&I [Member] | Substandard [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	26	338
2020/2019	382	6,364
2019/2018	7,504	10,219
2018/2017	5,514	3,388
2017/2016	2,741	791
Prior	3,823	4,272
Revolving Loans Amortized Cost Basis	7,318	9,945
Revolving Loans Converted to Term	257	14
Total	27,565	35,331
C&I [Member] | Doubtful [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	1	207
2017/2016	196	0
Prior	1	1
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	198	208
CRE [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	224,520	472,506
2020/2019	446,842	412,425
2019/2018	409,666	296,712
2018/2017	276,098	342,604
2017/2016	311,007	255,045
Prior	651,965	496,867
Revolving Loans Amortized Cost Basis	118,601	115,926
Revolving Loans Converted to Term	60,252	20,200
Total	2,498,951	2,412,285
CRE [Member] | Pass [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	224,088	469,919
2020/2019	445,353	361,187
2019/2018	351,481	256,154
2018/2017	252,634	271,874
2017/2016	275,791	212,197
Prior	516,252	383,690
Revolving Loans Amortized Cost Basis	116,287	113,128
Revolving Loans Converted to Term	60,252	4,034
Total	2,242,138	2,072,183
CRE [Member] | Special Mention [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	432	2,051
2020/2019	1,408	44,034
2019/2018	40,057	22,260
2018/2017	8,046	55,039
2017/2016	22,483	36,830
Prior	67,304	43,537
Revolving Loans Amortized Cost Basis	1,068	1,297
Revolving Loans Converted to Term	0	11,524
Total	140,798	216,572
CRE [Member] | Substandard [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	0	536
2020/2019	81	5,307
2019/2018	16,231	18,298
2018/2017	15,418	15,691
2017/2016	12,733	6,018
Prior	61,573	62,168
Revolving Loans Amortized Cost Basis	1,246	1,501
Revolving Loans Converted to Term	0	4,642
Total	107,282	114,161
CRE [Member] | Doubtful [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	0	0
2020/2019	0	1,897
2019/2018	1,897	0
2018/2017	0	0
2017/2016	0	0
Prior	6,836	7,472
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	8,733	9,369
PPP [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	270,953	430,810
2020/2019	88,785	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	359,738	430,810
PPP [Member] | Pass [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	270,953	430,810
2020/2019	88,785	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	359,738	430,810
Auto [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	205,017	198,240
2020/2019	165,014	315,174
2019/2018	244,408	202,985
2018/2017	145,033	116,502
2017/2016	75,425	45,932
Prior	28,190	13,250
Revolving Loans Amortized Cost Basis	20	22
Revolving Loans Converted to Term	0	0
Total	863,107	892,105
Auto [Member] | Performing [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	204,980	197,881
2020/2019	164,749	314,034
2019/2018	243,935	201,850
2018/2017	144,665	115,977
2017/2016	75,078	45,495
Prior	28,190	13,250
Revolving Loans Amortized Cost Basis	20	22
Revolving Loans Converted to Term	0	0
Total	861,617	888,509
Auto [Member] | Nonperforming [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	37	359
2020/2019	265	1,140
2019/2018	473	1,135
2018/2017	368	525
2017/2016	347	437
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	1,490	3,596
Other Consumer [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	157,725	234,967
2020/2019	183,650	178,829
2019/2018	143,414	127,856
2018/2017	99,516	55,941
2017/2016	40,695	14,345
Prior	22,040	17,547
Revolving Loans Amortized Cost Basis	15,623	18,598
Revolving Loans Converted to Term	37	71
Total	662,700	648,154
Other Consumer [Member] | Performing [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	157,719	234,628
2020/2019	183,271	178,411
2019/2018	143,208	127,549
2018/2017	99,444	55,676
2017/2016	40,466	14,255
Prior	22,031	17,414
Revolving Loans Amortized Cost Basis	15,621	18,588
Revolving Loans Converted to Term	17	71
Total	661,777	646,592
Other Consumer [Member] | Nonperforming [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	6	339
2020/2019	379	418
2019/2018	206	307
2018/2017	72	265
2017/2016	229	90
Prior	9	133
Revolving Loans Amortized Cost Basis	2	10
Revolving Loans Converted to Term	20	0
Total	923	1,562
Residential [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	161,399	238,583
2020/2019	234,013	211,164
2019/2018	200,119	215,755
2018/2017	193,844	185,528
2017/2016	166,842	165,326
Prior	773,037	694,690
Revolving Loans Amortized Cost Basis	246,550	268,878
Revolving Loans Converted to Term	12,397	9,991
Total	1,988,201	1,989,915
Residential [Member] | Performing [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	161,399	237,338
2020/2019	232,662	210,505
2019/2018	199,467	213,437
2018/2017	191,931	182,993
2017/2016	164,674	164,424
Prior	763,772	684,495
Revolving Loans Amortized Cost Basis	246,550	268,878
Revolving Loans Converted to Term	12,397	9,991
Total	1,972,852	1,972,061
Residential [Member] | Nonperforming [Member]
Credit Quality by Loan Class [Abstract]
2021/2020	0	1,245
2020/2019	1,351	659
2019/2018	652	2,318
2018/2017	1,913	2,535
2017/2016	2,168	902
Prior	9,265	10,195
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	$ 15,349	$ 17,854