Loans and Allowance for Credit Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total
Current period gross charge-offs	$ (39,201)	$ (21,472)
Current period recoveries	10,129	14,092
Portfolio Segment and Loan Class
2021
Total	1,744,297	2,094,526
2020
Total	1,953,966	2,014,166
2019
Total	1,981,737	1,677,176
2018
Total	1,428,026	1,250,572
2017
Total	1,091,506	878,822
Prior
Total	3,727,931	3,649,811
Revolving Loans Amortized Cost Basis
Total	1,696,870	1,624,415
Total
Total	13,675,866	13,190,912
Portfolio Segment and Loan Class | Pass
2021
Total	1,732,981	2,081,160
2020
Total	1,841,229	1,935,863
2019
Total	1,796,011	1,610,405
2018
Total	1,363,602	1,154,994
2017
Total	1,003,493	831,206
Prior
Total	3,455,090	3,308,374
Revolving Loans Amortized Cost Basis
Total	1,516,133	1,515,897
Total
Total	12,750,911	12,438,824
Portfolio Segment and Loan Class | Special Mention
2021
Total	10,703	11,500
2020
Total	66,074	74,846
2019
Total	147,582	27,059
2018
Total	11,439	41,882
2017
Total	42,106	21,423
Prior
Total	124,273	227,972
Revolving Loans Amortized Cost Basis
Total	74,535	56,995
Total
Total	476,910	461,927
Portfolio Segment and Loan Class | Substandard or Lower
2021
Total	613	1,866
2020
Total	46,663	3,457
2019
Total	38,144	39,712
2018
Total	52,985	53,696
2017
Total	45,907	26,193
Prior
Total	148,568	113,465
Revolving Loans Amortized Cost Basis
Total	106,202	51,523
Total
Total	448,045	290,161
Portfolio Segment and Loan Class | Real estate - commercial mortgage
2021
Total	786,806	1,015,702
Current period gross charge-offs	0	0
2020
Total	1,057,879	1,149,131
Current period gross charge-offs	0	0
2019
Total	1,340,341	1,023,456
Current period gross charge-offs	0	0
2018
Total	1,041,962	882,963
Current period gross charge-offs	0	0
2017
Total	783,725	661,006
Current period gross charge-offs	0	0
Prior
Total	3,023,562	2,879,415
Current period gross charge-offs	(424)	(53)
Revolving Loans Amortized Cost Basis
Total	61,817	81,855
Current period gross charge-offs	0	0
Total
Total	8,127,728	7,693,835
Current period gross charge-offs	(17,999)	(12,473)
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Pass
2021
Total	783,673	1,014,575
2020
Total	993,017	1,095,725
2019
Total	1,203,852	969,118
2018
Total	984,958	810,850
2017
Total	721,857	621,689
Prior
Total	2,822,155	2,610,511
Revolving Loans Amortized Cost Basis
Total	59,253	80,665
Total
Total	7,600,401	7,203,440
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Special Mention
2021
Total	2,767	95
2020
Total	43,904	50,367
2019
Total	105,185	23,296
2018
Total	7,862	33,735
2017
Total	35,289	16,205
Prior
Total	105,786	181,736
Revolving Loans Amortized Cost Basis
Total	1,760	947
Total
Total	302,553	306,381
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Substandard or Lower
2021
Total	366	1,032
2020
Total	20,958	3,039
2019
Total	31,304	31,042
2018
Total	49,142	38,378
2017
Total	26,579	23,112
Prior
Total	95,621	87,168
Revolving Loans Amortized Cost Basis
Total	804	243
Total
Total	224,774	184,014
Portfolio Segment and Loan Class | Commercial and Industrial
2021
Total	634,569	919,629
Current period gross charge-offs	0	0
2020
Total	624,864	474,042
Current period gross charge-offs	(299)	0
2019
Total	351,686	406,462
Current period gross charge-offs	0	(36)
2018
Total	348,638	336,796
Current period gross charge-offs	0	0
2017
Total	297,931	193,395
Current period gross charge-offs	0	(21)
Prior
Total	648,988	651,010
Current period gross charge-offs	(249)	(365)
Revolving Loans Amortized Cost Basis
Total	1,621,208	1,495,086
Current period gross charge-offs	(682)	(1,192)
Total
Total	4,545,552	4,477,537
Current period gross charge-offs	(9,246)	(2,390)
Portfolio Segment and Loan Class | Commercial and Industrial | Pass
2021
Total	626,386	907,390
2020
Total	590,132	449,145
2019
Total	330,576	397,881
2018
Total	341,218	315,605
2017
Total	272,126	185,096
Prior
Total	598,838	604,352
Revolving Loans Amortized Cost Basis
Total	1,443,203	1,387,961
Total
Total	4,213,215	4,248,048
Portfolio Segment and Loan Class | Commercial and Industrial | Special Mention
2021
Total	7,936	11,405
2020
Total	9,548	24,479
2019
Total	16,499	3,763
2018
Total	3,577	8,147
2017
Total	6,817	5,218
Prior
Total	18,487	24,633
Revolving Loans Amortized Cost Basis
Total	72,775	56,048
Total
Total	135,837	133,943
Portfolio Segment and Loan Class | Commercial and Industrial | Substandard or Lower
2021
Total	247	834
2020
Total	25,184	418
2019
Total	4,611	4,818
2018
Total	3,843	13,044
2017
Total	18,988	3,081
Prior
Total	31,663	22,025
Revolving Loans Amortized Cost Basis
Total	105,230	51,077
Total
Total	196,500	95,546
Portfolio Segment and Loan Class | Construction - Real Estate
2021
Total	322,922	159,195
Current period gross charge-offs	0	0
2020
Total	271,223	390,993
Current period gross charge-offs	0	0
2019
Total	289,710	247,258
Current period gross charge-offs	0	0
2018
Total	37,426	30,813
Current period gross charge-offs	0	0
2017
Total	9,850	24,421
Current period gross charge-offs	0	0
Prior
Total	55,381	119,386
Current period gross charge-offs	0	0
Revolving Loans Amortized Cost Basis
Total	13,845	47,474
Current period gross charge-offs	0	0
Total
Total	1,002,586	1,019,540
Current period gross charge-offs	0	0
Portfolio Segment and Loan Class | Construction - Real Estate | Pass
2021
Total	322,922	159,195
2020
Total	258,080	390,993
2019
Total	261,583	243,406
2018
Total	37,426	28,539
2017
Total	9,510	24,421
Prior
Total	34,097	93,511
Revolving Loans Amortized Cost Basis
Total	13,677	47,271
Total
Total	937,295	987,336
Portfolio Segment and Loan Class | Construction - Real Estate | Special Mention
2021
Total	0	0
2020
Total	12,622	0
2019
Total	25,898	0
2018
Total	0	0
2017
Total	0	0
Prior
Total	0	21,603
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	38,520	21,603
Portfolio Segment and Loan Class | Construction - Real Estate | Substandard or Lower
2021
Total	0	0
2020
Total	521	0
2019
Total	2,229	3,852
2018
Total	0	2,274
2017
Total	340	0
Prior
Total	21,284	4,272
Revolving Loans Amortized Cost Basis
Total	168	203
Total
Total	26,771	10,601
Payment Activity, Aging Status
2021
Total	1,189,985	1,663,147
2020
Total	1,583,817	1,936,748
2019
Total	1,815,951	1,192,235
2018
Total	1,074,318	374,362
2017
Total	320,549	153,878
Prior
Total	861,819	889,588
Revolving Loans Amortized Cost Basis
Total	807,084	843,948
Total
Total	7,675,228	7,088,635
Payment Activity, Aging Status | Performing
2021
Total	1,189,690	1,661,656
2020
Total	1,579,989	1,931,346
2019
Total	1,810,197	1,185,464
2018
Total	1,069,335	367,860
2017
Total	313,962	149,193
Prior
Total	821,913	847,213
Revolving Loans Amortized Cost Basis
Total	805,645	842,226
Total
Total	7,610,775	7,019,019
Payment Activity, Aging Status | Nonperforming
2021
Total	295	1,491
2020
Total	3,828	5,402
2019
Total	5,754	6,771
2018
Total	4,983	6,502
2017
Total	6,587	4,685
Prior
Total	39,906	42,375
Revolving Loans Amortized Cost Basis
Total	1,439	1,722
Total
Total	64,453	69,616
Payment Activity, Aging Status | Real-estate - home equity
2021
Total	272,866	416,923
Current period gross charge-offs	(119)	0
2020
Total	276,828	110,022
Current period gross charge-offs	0	(587)
2019
Total	86,851	80,596
Current period gross charge-offs	0	(70)
2018
Total	62,708	52,420
Current period gross charge-offs	0	(108)
2017
Total	38,021	45,740
Current period gross charge-offs	0	(16)
Prior
Total	210,439	217,639
Current period gross charge-offs	(525)	(442)
Revolving Loans Amortized Cost Basis
Total	807,084	843,948
Current period gross charge-offs	(283)	(178)
Total
Total	1,776,502	1,802,017
Current period gross charge-offs	(7,514)	(4,412)
Payment Activity, Aging Status | Real-estate - home equity | Performing
2021
Total	272,571	416,631
2020
Total	276,373	109,724
2019
Total	85,985	80,422
2018
Total	62,426	52,384
2017
Total	37,667	45,642
Prior
Total	204,913	211,127
Revolving Loans Amortized Cost Basis
Total	805,645	842,226
Total
Total	1,765,624	1,792,217
Payment Activity, Aging Status | Real-estate - home equity | Nonperforming
2021
Total	295	292
2020
Total	455	298
2019
Total	866	174
2018
Total	282	36
2017
Total	354	98
Prior
Total	5,526	6,512
Revolving Loans Amortized Cost Basis
Total	1,439	1,722
Total
Total	10,878	9,800
Payment Activity, Aging Status | Real estate – residential mortgage
2021
Total	623,247	935,102
Current period gross charge-offs	0	0
2020
Total	1,128,376	1,713,807
Current period gross charge-offs	0	0
2019
Total	1,687,647	1,060,723
Current period gross charge-offs	0	0
2018
Total	988,751	292,633
Current period gross charge-offs	0	0
2017
Total	266,282	92,042
Current period gross charge-offs	0	0
Prior
Total	631,620	642,972
Current period gross charge-offs	0	0
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs	0	0
Total
Total	5,325,923	4,737,279
Current period gross charge-offs	(62)	(66)
Payment Activity, Aging Status | Real estate – residential mortgage | Performing
2021
Total	623,247	933,903
2020
Total	1,126,656	1,708,703
2019
Total	1,682,759	1,054,126
2018
Total	984,050	286,167
2017
Total	260,049	87,455
Prior
Total	607,133	620,416
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	5,283,894	4,690,770
Payment Activity, Aging Status | Real estate – residential mortgage | Nonperforming
2021
Total	0	1,199
2020
Total	1,720	5,104
2019
Total	4,888	6,597
2018
Total	4,701	6,466
2017
Total	6,233	4,587
Prior
Total	24,487	22,556
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	42,029	46,509
Payment Activity, Aging Status | Leases and other loans
2021
Total	166,490	146,198
Current period gross charge-offs	(471)	(506)
2020
Total	83,759	39,427
Current period gross charge-offs	(521)	(167)
2019
Total	27,755	40,024
Current period gross charge-offs	(246)	(140)
2018
Total	22,304	29,309
Current period gross charge-offs	(128)	(80)
2017
Total	16,246	15,019
Current period gross charge-offs	(82)	(47)
Prior
Total	19,760	28,977
Current period gross charge-offs	(656)	(1,191)
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs	(765)	0
Total
Total	336,314	298,954
Current period gross charge-offs	(4,380)	(2,131)
Payment Activity, Aging Status | Leases and other loans | Performing
2021
Total	166,490	146,198
2020
Total	83,641	39,427
2019
Total	27,755	40,024
2018
Total	22,304	29,309
2017
Total	16,246	15,019
Prior
Total	9,867	15,670
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	326,303	285,647
Payment Activity, Aging Status | Leases and other loans | Nonperforming
2021
Total	0	0
2020
Total	118	0
2019
Total	0	0
2018
Total	0	0
2017
Total	0	0
Prior
Total	9,893	13,307
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	10,011	13,307
Payment Activity, Aging Status | Construction - other
2021
Total	127,382	164,924
Current period gross charge-offs	0	0
2020
Total	94,854	73,492
Current period gross charge-offs	0	0
2019
Total	13,698	10,892
Current period gross charge-offs	0	0
2018
Total	555	0
Current period gross charge-offs	0	0
2017
Total	0	1,077
Current period gross charge-offs	0	0
Prior
Total	0	0
Current period gross charge-offs	0	0
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs	0	0
Total
Total	236,489	250,385
Current period gross charge-offs	0	0
Payment Activity, Aging Status | Construction - other | Performing
2021
Total	127,382	164,924
2020
Total	93,319	73,492
2019
Total	13,698	10,892
2018
Total	555	0
2017
Total	0	1,077
Prior
Total	0	0
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	234,954	250,385
Payment Activity, Aging Status | Construction - other | Nonperforming
2021
Total	0	0
2020
Total	1,535	0
2019
Total	0	0
2018
Total	0	0
2017
Total	0	0
Prior
Total	0	0
Revolving Loans Amortized Cost Basis
Total	0	0
Total
Total	1,535	0
Conversion to Term Loan | Portfolio Segment and Loan Class
Revolving Loans Amortized Cost Basis
Total	51,533	1,424
Conversion to Term Loan | Portfolio Segment and Loan Class | Pass
Revolving Loans Amortized Cost Basis
Total	42,372	925
Conversion to Term Loan | Portfolio Segment and Loan Class | Special Mention
Revolving Loans Amortized Cost Basis
Total	198	250
Conversion to Term Loan | Portfolio Segment and Loan Class | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	8,963	249
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	31,636	307
Current period gross charge-offs	(17,575)	(12,420)
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage | Pass
Revolving Loans Amortized Cost Basis
Total	31,636	307
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage | Special Mention
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial
Revolving Loans Amortized Cost Basis
Total	17,668	1,117
Current period gross charge-offs	(8,016)	(776)
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Pass
Revolving Loans Amortized Cost Basis
Total	10,736	618
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Special Mention
Revolving Loans Amortized Cost Basis
Total	198	250
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	6,734	249
Conversion to Term Loan | Portfolio Segment and Loan Class | Construction - Real Estate
Revolving Loans Amortized Cost Basis
Total	2,229	0
Current period gross charge-offs	0	0
Conversion to Term Loan | Portfolio Segment and Loan Class | Construction - Real Estate | Pass
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Portfolio Segment and Loan Class | Construction - Real Estate | Special Mention
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Portfolio Segment and Loan Class | Construction - Real Estate | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	2,229	0
Conversion to Term Loan | Payment Activity, Aging Status
Revolving Loans Amortized Cost Basis
Total	21,705	34,729
Conversion to Term Loan | Payment Activity, Aging Status | Performing
Revolving Loans Amortized Cost Basis
Total	20,044	34,061
Conversion to Term Loan | Payment Activity, Aging Status | Nonperforming
Revolving Loans Amortized Cost Basis
Total	1,661	668
Conversion to Term Loan | Payment Activity, Aging Status | Real-estate - home equity
Revolving Loans Amortized Cost Basis
Total	21,705	34,729
Current period gross charge-offs	(6,587)	(3,011)
Conversion to Term Loan | Payment Activity, Aging Status | Real-estate - home equity | Performing
Revolving Loans Amortized Cost Basis
Total	20,044	34,061
Conversion to Term Loan | Payment Activity, Aging Status | Real-estate - home equity | Nonperforming
Revolving Loans Amortized Cost Basis
Total	1,661	668
Conversion to Term Loan | Payment Activity, Aging Status | Real estate – residential mortgage
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs	(62)	(66)
Conversion to Term Loan | Payment Activity, Aging Status | Real estate – residential mortgage | Performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Payment Activity, Aging Status | Real estate – residential mortgage | Nonperforming
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Payment Activity, Aging Status | Leases and other loans
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs	(1,511)	0
Conversion to Term Loan | Payment Activity, Aging Status | Leases and other loans | Performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Payment Activity, Aging Status | Leases and other loans | Nonperforming
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Payment Activity, Aging Status | Construction - other
Revolving Loans Amortized Cost Basis
Total	0	0
Current period gross charge-offs	0	0
Conversion to Term Loan | Payment Activity, Aging Status | Construction - other | Performing
Revolving Loans Amortized Cost Basis
Total	0	0
Conversion to Term Loan | Payment Activity, Aging Status | Construction - other | Nonperforming
Revolving Loans Amortized Cost Basis
Total	$ 0	$ 0