Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ 47,308		$ 58,768
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			34,776	$ 38,776	38,776
Provision for credit losses			(1,000)		(4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	$ 33,776		33,776		34,776
Allowance for credit losses on loans
Charge offs			47,308		58,768
Provision for credit losses	23,008	$ 22,100	47,009	40,071
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			351,094	312,720	312,720
Charge offs			(47,308)		(58,768)
Recoveries			4,058		10,142
Net Charge offs			(43,251)		(48,626)
Provision for credit losses			48,000		87,000
Financing Receivable, Allowance for Credit Loss, Ending Balance	355,844		355,844		351,094
Allowance for credit losses on loans
Charge offs			(47,308)		(58,768)
Recoveries			4,058		10,142
Net Charge offs			(43,251)		(48,626)
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			128,263	119,076	119,076
Charge offs			(33,708)		(45,687)
Recoveries			1,394		3,015
Net Charge offs			(32,314)		(42,672)
Provision for credit losses			29,942		51,859
Financing Receivable, Allowance for Credit Loss, Ending Balance	125,891		125,891		128,263
Allowance for credit losses on loans
Charge offs			(33,708)		(45,687)
Recoveries			1,394		3,015
Net Charge offs			(32,314)		(42,672)
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			10,610	9,475	9,475
Charge offs			(3)		(25)
Recoveries			6		11
Net Charge offs			4		(15)
Provision for credit losses			463		1,150
Financing Receivable, Allowance for Credit Loss, Ending Balance	11,077		11,077		10,610
Allowance for credit losses on loans
Charge offs			(3)		(25)
Recoveries			6		11
Net Charge offs			4		(15)
Allowance for Loan Losses [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			138,873	128,551	128,551
Charge offs			(33,710)		(45,713)
Recoveries			1,400		3,026
Net Charge offs			(32,310)		(42,687)
Provision for credit losses			30,405		53,009
Financing Receivable, Allowance for Credit Loss, Ending Balance	136,968		136,968		138,873
Allowance for credit losses on loans
Charge offs			(33,710)		(45,713)
Recoveries			1,400		3,026
Net Charge offs			(32,310)		(42,687)
Allowance for Loan Losses [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			67,858	54,398	54,398
Charge offs			(4,569)		(252)
Recoveries			0		3,016
Net Charge offs			(4,569)		2,763
Provision for credit losses			8,274		10,697
Financing Receivable, Allowance for Credit Loss, Ending Balance	71,563		71,563		67,858
Allowance for credit losses on loans
Charge offs			(4,569)		(252)
Recoveries			0		3,016
Net Charge offs			(4,569)		2,763
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			53,554	45,589	45,589
Charge offs			0		(25)
Recoveries			58		80
Net Charge offs			58		55
Provision for credit losses			2,285		7,910
Financing Receivable, Allowance for Credit Loss, Ending Balance	55,897		55,897		53,554
Allowance for credit losses on loans
Charge offs			0		(25)
Recoveries			58		80
Net Charge offs			58		55
Allowance for Loan Losses [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			121,412	99,986	99,986
Charge offs			(4,569)		(277)
Recoveries			58		3,095
Net Charge offs			(4,511)		2,819
Provision for credit losses			10,559		18,607
Financing Receivable, Allowance for Credit Loss, Ending Balance	127,459		127,459		121,412
Allowance for credit losses on loans
Charge offs			(4,569)		(277)
Recoveries			58		3,095
Net Charge offs			(4,511)		2,819
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			260,285	228,538	228,538
Charge offs			(38,279)		(45,989)
Recoveries			1,458		6,121
Net Charge offs			(36,821)		(39,868)
Provision for credit losses			40,963		71,616
Financing Receivable, Allowance for Credit Loss, Ending Balance	264,427		264,427		260,285
Allowance for credit losses on loans
Charge offs			(38,279)		(45,989)
Recoveries			1,458		6,121
Net Charge offs			(36,821)		(39,868)
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			37,808	38,298	38,298
Charge offs			(423)		(952)
Recoveries			72		541
Net Charge offs			(351)		(411)
Provision for credit losses			(2,915)		(79)
Financing Receivable, Allowance for Credit Loss, Ending Balance	34,542		34,542		37,808
Allowance for credit losses on loans
Charge offs			(423)		(952)
Recoveries			72		541
Net Charge offs			(351)		(411)
Allowance for Loan Losses [Member] | Automobile Loan
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			24,961	19,619	19,619
Charge offs			(4,996)		(5,950)
Recoveries			1,422		1,241
Net Charge offs			(3,574)		(4,709)
Provision for credit losses			6,383		10,051
Financing Receivable, Allowance for Credit Loss, Ending Balance	27,770		27,770		24,961
Allowance for credit losses on loans
Charge offs			(4,996)		(5,950)
Recoveries			1,422		1,241
Net Charge offs			(3,574)		(4,709)
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			15,403	14,875	14,875
Charge offs			(147)		(424)
Recoveries			596		1,262
Net Charge offs			449		837
Provision for credit losses			240		(310)
Financing Receivable, Allowance for Credit Loss, Ending Balance	16,092		16,092		15,403
Allowance for credit losses on loans
Charge offs			(147)		(424)
Recoveries			596		1,262
Net Charge offs			449		837
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			12,638	11,390	11,390
Charge offs			(3,463)		(5,453)
Recoveries			509		978
Net Charge offs			(2,954)		(4,475)
Provision for credit losses			3,329		5,723
Financing Receivable, Allowance for Credit Loss, Ending Balance	13,013		13,013		12,638
Allowance for credit losses on loans
Charge offs			(3,463)		(5,453)
Recoveries			509		978
Net Charge offs			(2,954)		(4,475)
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			90,809	84,182	84,182
Charge offs			(9,029)		(12,779)
Recoveries			2,600		4,021
Net Charge offs			(6,429)		(8,758)
Provision for credit losses			7,037		15,384
Financing Receivable, Allowance for Credit Loss, Ending Balance	91,417		91,417		90,809
Allowance for credit losses on loans
Charge offs			(9,029)		(12,779)
Recoveries			2,600		4,021
Net Charge offs			(6,429)		(8,758)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			34,776	38,776	38,776
Provision for credit losses			(1,000)		(4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	33,776		33,776		34,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			13,319	12,997	12,997
Provision for credit losses			(182)		321
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	13,137		13,137		13,319
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			149	103	103
Provision for credit losses			20		46
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	169		169		149
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			13,468	13,101	13,101
Provision for credit losses			(162)		367
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	13,306		13,306		13,468
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			480	710	710
Provision for credit losses			113		(230)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	593		593		480
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			17,024	20,583	20,583
Provision for credit losses			(1,241)		(3,558)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	15,783		15,783		17,024
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			17,504	21,292	21,292
Provision for credit losses			(1,128)		(3,788)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	16,376		16,376		17,504
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			30,972	34,393	34,393
Provision for credit losses			(1,290)		(3,421)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	29,682		29,682		30,972
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			2,629	2,699	2,699
Provision for credit losses			(146)		(70)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	2,483		2,483		2,629
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			1,174	1,683	1,683
Provision for credit losses			436		(509)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	1,610		1,610		1,174
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			3,803	4,382	4,382
Provision for credit losses			290		(579)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	4,093		4,093		3,803
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			(47,308)		(58,768)
Recoveries			4,058		10,142
Net Charge offs			(43,251)		(48,626)
Allowance for credit losses on loans
Balance at beginning of period			385,870	351,496	351,496
Charge offs			(47,308)		(58,768)
Recoveries			4,058		10,142
Net Charge offs			(43,251)		(48,626)
Provision for credit losses			47,000		83,000
Balance at end of period	$ 389,620		$ 389,620		$ 385,870
Percent of Loans	1.32%		1.32%		1.32%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (33,708)		$ (45,687)
Recoveries			1,394		3,015
Net Charge offs			(32,314)		(42,672)
Allowance for credit losses on loans
Balance at beginning of period			141,582	132,073	132,073
Charge offs			(33,708)		(45,687)
Recoveries			1,394		3,015
Net Charge offs			(32,314)		(42,672)
Provision for credit losses			29,760		52,181
Balance at end of period	$ 139,028		$ 139,028		$ 141,582
Percent of Loans	1.39%		1.39%		1.45%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (3)		$ (25)
Recoveries			6		11
Net Charge offs			4		(15)
Allowance for credit losses on loans
Balance at beginning of period			10,759	9,579	9,579
Charge offs			(3)		(25)
Recoveries			6		11
Net Charge offs			4		(15)
Provision for credit losses			483		1,195
Balance at end of period	$ 11,246		$ 11,246		$ 10,759
Percent of Loans	1.02%		1.02%		1.01%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (33,710)		$ (45,713)
Recoveries			1,400		3,026
Net Charge offs			(32,310)		(42,687)
Allowance for credit losses on loans
Balance at beginning of period			152,341	141,652	141,652
Charge offs			(33,710)		(45,713)
Recoveries			1,400		3,026
Net Charge offs			(32,310)		(42,687)
Provision for credit losses			30,243		53,376
Balance at end of period	$ 150,274		$ 150,274		$ 152,341
Percent of Loans	1.36%		1.36%		1.41%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (4,569)		$ (252)
Recoveries			0		3,016
Net Charge offs			(4,569)		2,763
Allowance for credit losses on loans
Balance at beginning of period			68,338	55,108	55,108
Charge offs			(4,569)		(252)
Recoveries			0		3,016
Net Charge offs			(4,569)		2,763
Provision for credit losses			8,387		10,467
Balance at end of period	$ 72,156		$ 72,156		$ 68,338
Percent of Loans	1.44%		1.44%		1.33%
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ 0		$ (25)
Recoveries			58		80
Net Charge offs			58		55
Allowance for credit losses on loans
Balance at beginning of period			70,578	66,171	66,171
Charge offs			0		(25)
Recoveries			58		80
Net Charge offs			58		55
Provision for credit losses			1,043		4,351
Balance at end of period	$ 71,680		$ 71,680		$ 70,578
Percent of Loans	3.18%		3.18%		3.11%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (4,569)		$ (277)
Recoveries			58		3,095
Net Charge offs			(4,511)		2,819
Allowance for credit losses on loans
Balance at beginning of period			138,916	121,279	121,279
Charge offs			(4,569)		(277)
Recoveries			58		3,095
Net Charge offs			(4,511)		2,819
Provision for credit losses			9,430		14,819
Balance at end of period	$ 143,835		$ 143,835		$ 138,916
Percent of Loans	1.98%		1.98%		1.88%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (38,279)		$ (45,989)
Recoveries			1,458		6,121
Net Charge offs			(36,821)		(39,868)
Allowance for credit losses on loans
Balance at beginning of period			291,257	262,931	262,931
Charge offs			(38,279)		(45,989)
Recoveries			1,458		6,121
Net Charge offs			(36,821)		(39,868)
Provision for credit losses			39,673		68,195
Balance at end of period	$ 294,109		$ 294,109		$ 291,257
Percent of Loans	1.60%		1.60%		1.60%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (423)		$ (952)
Recoveries			72		541
Net Charge offs			(351)		(411)
Allowance for credit losses on loans
Balance at beginning of period			37,808	38,298	38,298
Charge offs			(423)		(952)
Recoveries			72		541
Net Charge offs			(351)		(411)
Provision for credit losses			(2,915)		(79)
Balance at end of period	$ 34,542		$ 34,542		$ 37,808
Percent of Loans	0.44%		0.44%		0.48%
Allowance for Loans Losses and Unfunded Commitments [Member] | Automobile Loan
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (4,996)		$ (5,950)
Recoveries			1,422		1,241
Net Charge offs			(3,574)		(4,709)
Allowance for credit losses on loans
Balance at beginning of period			24,961	19,619	19,619
Charge offs			(4,996)		(5,950)
Recoveries			1,422		1,241
Net Charge offs			(3,574)		(4,709)
Provision for credit losses			6,383		10,051
Balance at end of period	$ 27,770		$ 27,770		$ 24,961
Percent of Loans	1.09%		1.09%		1.11%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (147)		$ (424)
Recoveries			596		1,262
Net Charge offs			449		837
Allowance for credit losses on loans
Balance at beginning of period			18,032	17,574	17,574
Charge offs			(147)		(424)
Recoveries			596		1,262
Net Charge offs			449		837
Provision for credit losses			93		(380)
Balance at end of period	$ 18,575		$ 18,575		$ 18,032
Percent of Loans	2.93%		2.93%		2.87%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (3,463)		$ (5,453)
Recoveries			509		978
Net Charge offs			(2,954)		(4,475)
Allowance for credit losses on loans
Balance at beginning of period			13,812	13,073	13,073
Charge offs			(3,463)		(5,453)
Recoveries			509		978
Net Charge offs			(2,954)		(4,475)
Provision for credit losses			3,765		5,214
Balance at end of period	$ 14,623		$ 14,623		$ 13,812
Percent of Loans	5.66%		5.66%		4.97%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (9,029)		$ (12,779)
Recoveries			2,600		4,021
Net Charge offs			(6,429)		(8,758)
Allowance for credit losses on loans
Balance at beginning of period			94,613	$ 88,565	88,565
Charge offs			(9,029)		(12,779)
Recoveries			2,600		4,021
Net Charge offs			(6,429)		(8,758)
Provision for credit losses			7,327		14,805
Balance at end of period	$ 95,510		$ 95,510		$ 94,613
Percent of Loans	0.85%		0.85%		0.86%