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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ 20,356
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance			38,776	$ 39,776	$ 39,776
Provision for credit losses			(500)		(1,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	$ 38,276		38,276		38,776
Allowance for credit losses on loans
Charge offs			20,356
Provision for credit losses	22,100	$ (2)	40,071	(3,992)
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			312,720	280,015	280,015
Charge offs			(20,356)		(10,146)
Recoveries			5,886		8,852
Net Charge offs			(14,470)		(1,294)
Provision for credit losses			40,500		34,000
Financing Receivable, Allowance for Credit Loss, Ending Balance	338,750		338,750		312,720
Allowance for credit losses on loans
Charge offs			(20,356)		(10,146)
Recoveries			5,886		8,852
Net Charge offs			(14,470)		(1,294)
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			119,076	89,857	89,857
Charge offs			(14,489)		(4,491)
Recoveries			1,552		5,282
Net Charge offs			(12,936)		791
Provision for credit losses			17,011		28,428
Financing Receivable, Allowance for Credit Loss, Ending Balance	123,151		123,151		119,076
Allowance for credit losses on loans
Charge offs			(14,489)		(4,491)
Recoveries			1,552		5,282
Net Charge offs			(12,936)		791
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			9,475	11,473	11,473
Charge offs			0		0
Recoveries			6		13
Net Charge offs			6		13
Provision for credit losses			1,565		(2,011)
Financing Receivable, Allowance for Credit Loss, Ending Balance	11,047		11,047		9,475
Allowance for credit losses on loans
Charge offs			0		0
Recoveries			6		13
Net Charge offs			6		13
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			128,551	101,330	101,330
Charge offs			(14,489)		(4,491)
Recoveries			1,558		5,295
Net Charge offs			(12,930)		804
Provision for credit losses			18,576		26,418
Financing Receivable, Allowance for Credit Loss, Ending Balance	134,197		134,197		128,551
Allowance for credit losses on loans
Charge offs			(14,489)		(4,491)
Recoveries			1,558		5,295
Net Charge offs			(12,930)		804
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			54,398	72,803	72,803
Charge offs			(242)		(50)
Recoveries			2,517		50
Net Charge offs			2,276		0
Provision for credit losses			9,953		(18,405)
Financing Receivable, Allowance for Credit Loss, Ending Balance	66,627		66,627		54,398
Allowance for credit losses on loans
Charge offs			(242)		(50)
Recoveries			2,517		50
Net Charge offs			2,276		0
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			45,589	37,643	37,643
Charge offs			(25)		(48)
Recoveries			24		106
Net Charge offs			0		58
Provision for credit losses			3,106		7,887
Financing Receivable, Allowance for Credit Loss, Ending Balance	48,694		48,694		45,589
Allowance for credit losses on loans
Charge offs			(25)		(48)
Recoveries			24		106
Net Charge offs			0		58
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			99,986	110,446	110,446
Charge offs			(266)		(98)
Recoveries			2,542		156
Net Charge offs			2,275		58
Provision for credit losses			13,059		(10,518)
Financing Receivable, Allowance for Credit Loss, Ending Balance	115,321		115,321		99,986
Allowance for credit losses on loans
Charge offs			(266)		(98)
Recoveries			2,542		156
Net Charge offs			2,275		58
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			228,538	211,776	211,776
Charge offs			(14,755)		(4,588)
Recoveries			4,100		5,451
Net Charge offs			(10,655)		862
Provision for credit losses			31,636		15,900
Financing Receivable, Allowance for Credit Loss, Ending Balance	249,518		249,518		228,538
Allowance for credit losses on loans
Charge offs			(14,755)		(4,588)
Recoveries			4,100		5,451
Net Charge offs			(10,655)		862
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			38,298	40,787	40,787
Charge offs			(574)		(567)
Recoveries			238		908
Net Charge offs			(336)		341
Provision for credit losses			3,227		(2,830)
Financing Receivable, Allowance for Credit Loss, Ending Balance	41,189		41,189		38,298
Allowance for credit losses on loans
Charge offs			(574)		(567)
Recoveries			238		908
Net Charge offs			(336)		341
Allowance for Loan Losses [Member] | Auto finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			19,619	1,999	1,999
Charge offs			(2,335)		(1,041)
Recoveries			331		98
Net Charge offs			(2,004)		(943)
Provision for credit losses			2,735		18,563
Financing Receivable, Allowance for Credit Loss, Ending Balance	20,350		20,350		19,619
Allowance for credit losses on loans
Charge offs			(2,335)		(1,041)
Recoveries			331		98
Net Charge offs			(2,004)		(943)
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			14,875	14,011	14,011
Charge offs			(186)		(587)
Recoveries			710		1,385
Net Charge offs			524		798
Provision for credit losses			105		66
Financing Receivable, Allowance for Credit Loss, Ending Balance	15,504		15,504		14,875
Allowance for credit losses on loans
Charge offs			(186)		(587)
Recoveries			710		1,385
Net Charge offs			524		798
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			11,390	11,441	11,441
Charge offs			(2,506)		(3,363)
Recoveries			508		1,010
Net Charge offs			(1,998)		(2,353)
Provision for credit losses			2,798		2,301
Financing Receivable, Allowance for Credit Loss, Ending Balance	12,189		12,189		11,390
Allowance for credit losses on loans
Charge offs			(2,506)		(3,363)
Recoveries			508		1,010
Net Charge offs			(1,998)		(2,353)
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance			84,182	68,239	68,239
Charge offs			(5,601)		(5,558)
Recoveries			1,787		3,401
Net Charge offs			(3,815)		(2,157)
Provision for credit losses			8,864		18,100
Financing Receivable, Allowance for Credit Loss, Ending Balance	89,232		89,232		84,182
Allowance for credit losses on loans
Charge offs			(5,601)		(5,558)
Recoveries			1,787		3,401
Net Charge offs			(3,815)		(2,157)
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			38,776	39,776	39,776
Provision for credit losses			(500)		(1,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	38,276		38,276		38,776
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			12,997	18,459	18,459
Provision for credit losses			(969)		(5,462)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	12,028		12,028		12,997
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			103	208	208
Provision for credit losses			6		(105)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	109		109		103
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			13,101	18,667	18,667
Provision for credit losses			(964)		(5,566)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	12,137		12,137		13,101
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			710	936	936
Provision for credit losses			98		(226)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	807		807		710
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			20,583	15,586	15,586
Provision for credit losses			693		4,997
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	21,276		21,276		20,583
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			21,292	16,522	16,522
Provision for credit losses			791		4,770
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	22,084		22,084		21,292
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			34,393	35,189	35,189
Provision for credit losses			(173)		(796)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	34,221		34,221		34,393
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			2,699	2,592	2,592
Provision for credit losses			107		107
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	2,806		2,806		2,699
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			1,683	1,995	1,995
Provision for credit losses			(434)		(311)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	1,249		1,249		1,683
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			4,382	4,587	4,587
Provision for credit losses			(327)		(204)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	4,055		4,055		4,382
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			(20,356)		(10,146)
Recoveries			5,886		8,852
Net Charge offs			(14,470)		(1,294)
Allowance for credit losses on loans
Balance at beginning of period			351,496	319,791	319,791
Charge offs			(20,356)		(10,146)
Recoveries			5,886		8,852
Net Charge offs			(14,470)		(1,294)
Provision for credit losses			40,000		33,000
Balance at end of period	$ 377,027		$ 377,027		$ 351,496
Percent of Loans	1.26%		1.26%		1.22%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (14,489)		$ (4,491)
Recoveries			1,552		5,282
Net Charge offs			(12,936)		791
Allowance for credit losses on loans
Balance at beginning of period			132,073	108,316	108,316
Charge offs			(14,489)		(4,491)
Recoveries			1,552		5,282
Net Charge offs			(12,936)		791
Provision for credit losses			16,042		22,967
Balance at end of period	$ 135,179		$ 135,179		$ 132,073
Percent of Loans	1.34%		1.34%		1.35%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ 0		$ 0
Recoveries			6		13
Net Charge offs			6		13
Allowance for credit losses on loans
Balance at beginning of period			9,579	11,681	11,681
Charge offs			0		0
Recoveries			6		13
Net Charge offs			6		13
Provision for credit losses			1,571		(2,115)
Balance at end of period	$ 11,156		$ 11,156		$ 9,579
Percent of Loans	1.05%		1.05%		0.97%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (14,489)		$ (4,491)
Recoveries			1,558		5,295
Net Charge offs			(12,930)		804
Allowance for credit losses on loans
Balance at beginning of period			141,652	119,997	119,997
Charge offs			(14,489)		(4,491)
Recoveries			1,558		5,295
Net Charge offs			(12,930)		804
Provision for credit losses			17,613		20,852
Balance at end of period	$ 146,335		$ 146,335		$ 141,652
Percent of Loans	1.32%		1.32%		1.32%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (242)		$ (50)
Recoveries			2,517		50
Net Charge offs			2,276		0
Allowance for credit losses on loans
Balance at beginning of period			55,108	73,739	73,739
Charge offs			(242)		(50)
Recoveries			2,517		50
Net Charge offs			2,276		0
Provision for credit losses			10,051		(18,631)
Balance at end of period	$ 67,434		$ 67,434		$ 55,108
Percent of Loans	1.27%		1.27%		1.08%
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (25)		$ (48)
Recoveries			24		106
Net Charge offs			0		58
Allowance for credit losses on loans
Balance at beginning of period			66,171	53,229	53,229
Charge offs			(25)		(48)
Recoveries			24		106
Net Charge offs			0		58
Provision for credit losses			3,799		12,884
Balance at end of period	$ 69,970		$ 69,970		$ 66,171
Percent of Loans	3.48%		3.48%		3.07%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (266)		$ (98)
Recoveries			2,542		156
Net Charge offs			2,275		58
Allowance for credit losses on loans
Balance at beginning of period			121,279	126,968	126,968
Charge offs			(266)		(98)
Recoveries			2,542		156
Net Charge offs			2,275		58
Provision for credit losses			13,850		(5,748)
Balance at end of period	$ 137,404		$ 137,404		$ 121,279
Percent of Loans	1.88%		1.88%		1.68%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (14,755)		$ (4,588)
Recoveries			4,100		5,451
Net Charge offs			(10,655)		862
Allowance for credit losses on loans
Balance at beginning of period			262,931	246,965	246,965
Charge offs			(14,755)		(4,588)
Recoveries			4,100		5,451
Net Charge offs			(10,655)		862
Provision for credit losses			31,463		15,104
Balance at end of period	$ 283,739		$ 283,739		$ 262,931
Percent of Loans	1.54%		1.54%		1.46%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (574)		$ (567)
Recoveries			238		908
Net Charge offs			(336)		341
Allowance for credit losses on loans
Balance at beginning of period			38,298	40,787	40,787
Charge offs			(574)		(567)
Recoveries			238		908
Net Charge offs			(336)		341
Provision for credit losses			3,227		(2,830)
Balance at end of period	$ 41,189		$ 41,189		$ 38,298
Percent of Loans	0.47%		0.47%		0.45%
Allowance for Loans Losses and Unfunded Commitments [Member] | Auto finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (2,335)		$ (1,041)
Recoveries			331		98
Net Charge offs			(2,004)		(943)
Allowance for credit losses on loans
Balance at beginning of period			19,619	1,999	1,999
Charge offs			(2,335)		(1,041)
Recoveries			331		98
Net Charge offs			(2,004)		(943)
Provision for credit losses			2,735		18,563
Balance at end of period	$ 20,350		$ 20,350		$ 19,619
Percent of Loans	1.14%		1.14%		1.42%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (186)		$ (587)
Recoveries			710		1,385
Net Charge offs			524		798
Allowance for credit losses on loans
Balance at beginning of period			17,574	16,603	16,603
Charge offs			(186)		(587)
Recoveries			710		1,385
Net Charge offs			524		798
Provision for credit losses			212		173
Balance at end of period	$ 18,310		$ 18,310		$ 17,574
Percent of Loans	2.97%		2.97%		2.81%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (2,506)		$ (3,363)
Recoveries			508		1,010
Net Charge offs			(1,998)		(2,353)
Allowance for credit losses on loans
Balance at beginning of period			13,073	13,436	13,436
Charge offs			(2,506)		(3,363)
Recoveries			508		1,010
Net Charge offs			(1,998)		(2,353)
Provision for credit losses			2,363		1,990
Balance at end of period	$ 13,438		$ 13,438		$ 13,073
Percent of Loans	4.92%		4.92%		4.43%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge offs			$ (5,601)		$ (5,558)
Recoveries			1,787		3,401
Net Charge offs			(3,815)		(2,157)
Allowance for credit losses on loans
Balance at beginning of period			88,565	$ 72,825	72,825
Charge offs			(5,601)		(5,558)
Recoveries			1,787		3,401
Net Charge offs			(3,815)		(2,157)
Provision for credit losses			8,537		17,896
Balance at end of period	$ 93,287		$ 93,287		$ 88,565
Percent of Loans	0.82%		0.82%		0.82%