Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 13,714		$ 76,415
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	38,776	$ 34,776	34,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(3,500)		4,000
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	35,276		38,776
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	13,714		76,415
Provision for Loan, Lease, and Other Losses	13,003	24,001
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	363,545	351,094	351,094
Financing Receivable, Allowance for Credit Loss, Writeoff	(13,714)		(76,415)
Financing Receivable, Allowance for Credit Loss, Recovery	5,017		7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(8,698)		(68,549)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	16,500		81,000
Financing Receivable, Allowance for Credit Loss, Ending Balance	371,348		363,545
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(13,714)		(76,415)
Financing Receivable, Allowance for Credit Loss, Recovery	5,017		7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(8,698)		(68,549)
Allowance for Loan Losses [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	136,596	128,263	128,263
Financing Receivable, Allowance for Credit Loss, Writeoff	(7,692)		(47,517)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,369)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	12,343		53,703
Financing Receivable, Allowance for Credit Loss, Ending Balance	144,213		136,596
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(7,692)		(47,517)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,369)
Allowance for Loan Losses [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	9,417	10,610	10,610
Financing Receivable, Allowance for Credit Loss, Writeoff	0		(3)
Financing Receivable, Allowance for Credit Loss, Recovery	0		7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	0		4
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	2,009		(1,198)
Financing Receivable, Allowance for Credit Loss, Ending Balance	11,426		9,417
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	0		(3)
Financing Receivable, Allowance for Credit Loss, Recovery	0		7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	0		4
Allowance for Loan Losses [Member] | Commercial And Business Lending [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	146,013	138,873	138,873
Financing Receivable, Allowance for Credit Loss, Writeoff	(7,692)		(47,520)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,365)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	14,352		52,505
Financing Receivable, Allowance for Credit Loss, Ending Balance	155,639		146,013
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(7,692)		(47,520)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,365)
Allowance for Loan Losses [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	71,547	67,858	67,858
Financing Receivable, Allowance for Credit Loss, Writeoff	(892)		(11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	0		0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(892)		(11,187)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	7,533		14,876
Financing Receivable, Allowance for Credit Loss, Ending Balance	78,187		71,547
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(892)		(11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	0		0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(892)		(11,187)
Allowance for Loan Losses [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	51,499	53,554	53,554
Financing Receivable, Allowance for Credit Loss, Writeoff	0		0
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(5,216)		(2,119)
Financing Receivable, Allowance for Credit Loss, Ending Balance	46,313		51,499
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	0		0
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	30		65
Allowance for Loan Losses [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	123,046	121,412	121,412
Financing Receivable, Allowance for Credit Loss, Writeoff	(892)		(11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(863)		(11,122)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	2,317		12,756
Financing Receivable, Allowance for Credit Loss, Ending Balance	124,500		123,046
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(892)		(11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(863)		(11,122)
Allowance for Loan Losses [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	269,060	260,285	260,285
Financing Receivable, Allowance for Credit Loss, Writeoff	(8,585)		(58,707)
Financing Receivable, Allowance for Credit Loss, Recovery	2,996		2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,589)		(56,487)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	16,669		65,262
Financing Receivable, Allowance for Credit Loss, Ending Balance	280,139		269,060
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(8,585)		(58,707)
Financing Receivable, Allowance for Credit Loss, Recovery	2,996		2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,589)		(56,487)
Allowance for Loan Losses [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	32,576	37,808	37,808
Financing Receivable, Allowance for Credit Loss, Writeoff	(239)		(1,029)
Financing Receivable, Allowance for Credit Loss, Recovery	436		280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	197		(750)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1,388		(4,483)
Financing Receivable, Allowance for Credit Loss, Ending Balance	34,160		32,576
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(239)		(1,029)
Financing Receivable, Allowance for Credit Loss, Recovery	436		280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	197		(750)
Allowance for Loan Losses [Member] | Automobile Loan [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	28,467	24,961	24,961
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,330)		(9,541)
Financing Receivable, Allowance for Credit Loss, Recovery	811		2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1,519)		(6,637)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(916)		10,142
Financing Receivable, Allowance for Credit Loss, Ending Balance	26,032		28,467
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,330)		(9,541)
Financing Receivable, Allowance for Credit Loss, Recovery	811		2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1,519)		(6,637)
Allowance for Loan Losses [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	16,620	15,403	15,403
Financing Receivable, Allowance for Credit Loss, Writeoff	(61)		(216)
Financing Receivable, Allowance for Credit Loss, Recovery	350		1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	289		1,150
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(1,193)		67
Financing Receivable, Allowance for Credit Loss, Ending Balance	15,716		16,620
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(61)		(216)
Financing Receivable, Allowance for Credit Loss, Recovery	350		1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	289		1,150
Allowance for Loan Losses [Member] | Other Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	16,824	12,638	12,638
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,500)		(6,922)
Financing Receivable, Allowance for Credit Loss, Recovery	424		1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(2,076)		(5,826)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	553		10,012
Financing Receivable, Allowance for Credit Loss, Ending Balance	15,300		16,824
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,500)		(6,922)
Financing Receivable, Allowance for Credit Loss, Recovery	424		1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(2,076)		(5,826)
Allowance for Loan Losses [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	94,486	90,809	90,809
Financing Receivable, Allowance for Credit Loss, Writeoff	(5,130)		(17,709)
Financing Receivable, Allowance for Credit Loss, Recovery	2,021		5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(3,109)		(12,062)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(169)		15,738
Financing Receivable, Allowance for Credit Loss, Ending Balance	91,209		94,486
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(5,130)		(17,709)
Financing Receivable, Allowance for Credit Loss, Recovery	2,021		5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(3,109)		(12,062)
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	34,776	34,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(3,500)		4,000
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	35,276		38,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and Industrial Sector [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	14,456	13,319	13,319
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	2,048		1,137
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	16,504		14,456
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	151	149	149
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(37)		2
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	114		151
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial And Business Lending [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	14,607	13,468	13,468
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	2,011		1,139
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	16,618		14,607
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	578	480	480
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	384		98
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	962		578
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Construction Loans [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	19,591	17,024	17,024
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(6,031)		2,567
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	13,560		19,591
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	20,169	17,504	17,504
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(5,647)		2,664
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	14,522		20,169
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	34,776	30,972	30,972
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(3,636)		3,803
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	31,140		34,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home Equity Line of Credit [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	2,465	2,629	2,629
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(12)		(164)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	2,453		2,465
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other Consumer [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	1,535	1,174	1,174
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	148		361
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	1,683		1,535
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Consumer Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	4,000	3,803	3,803
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	136		197
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	4,136		4,000
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	(13,714)		(76,415)
Financing Receivable, Allowance for Credit Loss, Recovery	5,017		7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(8,698)		(68,549)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	402,322	385,870	385,870
Financing Receivable, Allowance for Credit Loss, Writeoff	(13,714)		(76,415)
Financing Receivable, Allowance for Credit Loss, Recovery	5,017		7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(8,698)		(68,549)
Provision for Loan, Lease, and Other Losses	13,000		85,000
Balance at end of period	$ 406,624		$ 402,322
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.34%		1.35%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (7,692)		$ (47,517)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,369)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	151,052	141,582	141,582
Financing Receivable, Allowance for Credit Loss, Writeoff	(7,692)		(47,517)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,369)
Provision for Loan, Lease, and Other Losses	14,391		54,840
Balance at end of period	$ 160,717		$ 151,052
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.47%		1.43%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 0		$ (3)
Financing Receivable, Allowance for Credit Loss, Recovery	0		7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	0		4
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	9,568	10,759	10,759
Financing Receivable, Allowance for Credit Loss, Writeoff	0		(3)
Financing Receivable, Allowance for Credit Loss, Recovery	0		7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	0		4
Provision for Loan, Lease, and Other Losses	1,972		(1,196)
Balance at end of period	$ 11,540		$ 9,568
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.03%		0.84%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial And Business Lending [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (7,692)		$ (47,520)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,365)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	160,620	152,341	152,341
Financing Receivable, Allowance for Credit Loss, Writeoff	(7,692)		(47,520)
Financing Receivable, Allowance for Credit Loss, Recovery	2,966		2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4,726)		(45,365)
Provision for Loan, Lease, and Other Losses	16,363		53,644
Balance at end of period	$ 172,257		$ 160,620
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.43%		1.37%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (892)		$ (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	0		0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(892)		(11,187)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	72,125	68,338	68,338
Financing Receivable, Allowance for Credit Loss, Writeoff	(892)		(11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	0		0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(892)		(11,187)
Provision for Loan, Lease, and Other Losses	7,917		14,973
Balance at end of period	$ 79,149		$ 72,125
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.41%		1.38%
Allowance for Loans Losses and Unfunded Commitments [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 0		$ 0
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	30		65
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	71,090	70,578	70,578
Financing Receivable, Allowance for Credit Loss, Writeoff	0		0
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	30		65
Provision for Loan, Lease, and Other Losses	(11,247)		447
Balance at end of period	$ 59,873		$ 71,090
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	3.31%		3.59%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (892)		$ (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(863)		(11,122)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	143,215	138,916	138,916
Financing Receivable, Allowance for Credit Loss, Writeoff	(892)		(11,187)
Financing Receivable, Allowance for Credit Loss, Recovery	30		65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(863)		(11,122)
Provision for Loan, Lease, and Other Losses	(3,330)		15,421
Balance at end of period	$ 139,022		$ 143,215
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.88%		1.99%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (8,585)		$ (58,707)
Financing Receivable, Allowance for Credit Loss, Recovery	2,996		2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,589)		(56,487)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	303,835	291,257	291,257
Financing Receivable, Allowance for Credit Loss, Writeoff	(8,585)		(58,707)
Financing Receivable, Allowance for Credit Loss, Recovery	2,996		2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,589)		(56,487)
Provision for Loan, Lease, and Other Losses	13,033		69,065
Balance at end of period	$ 311,279		$ 303,835
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.60%		1.61%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (239)		$ (1,029)
Financing Receivable, Allowance for Credit Loss, Recovery	436		280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	197		(750)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	32,576	37,808	37,808
Financing Receivable, Allowance for Credit Loss, Writeoff	(239)		(1,029)
Financing Receivable, Allowance for Credit Loss, Recovery	436		280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	197		(750)
Provision for Loan, Lease, and Other Losses	1,388		(4,483)
Balance at end of period	$ 34,160		$ 32,576
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	0.49%		0.46%
Allowance for Loans Losses and Unfunded Commitments [Member] | Automobile Loan [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (2,330)		$ (9,541)
Financing Receivable, Allowance for Credit Loss, Recovery	811		2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1,519)		(6,637)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	28,467	24,961	24,961
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,330)		(9,541)
Financing Receivable, Allowance for Credit Loss, Recovery	811		2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1,519)		(6,637)
Provision for Loan, Lease, and Other Losses	(916)		10,142
Balance at end of period	$ 26,032		$ 28,467
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	0.90%		1.01%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (61)		$ (216)
Financing Receivable, Allowance for Credit Loss, Recovery	350		1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	289		1,150
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	19,085	18,032	18,032
Financing Receivable, Allowance for Credit Loss, Writeoff	(61)		(216)
Financing Receivable, Allowance for Credit Loss, Recovery	350		1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	289		1,150
Provision for Loan, Lease, and Other Losses	(1,205)		(97)
Balance at end of period	$ 18,169		$ 19,085
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	2.78%		2.87%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (2,500)		$ (6,922)
Financing Receivable, Allowance for Credit Loss, Recovery	424		1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(2,076)		(5,826)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	18,359	13,812	13,812
Financing Receivable, Allowance for Credit Loss, Writeoff	(2,500)		(6,922)
Financing Receivable, Allowance for Credit Loss, Recovery	424		1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(2,076)		(5,826)
Provision for Loan, Lease, and Other Losses	700		10,373
Balance at end of period	$ 16,983		$ 18,359
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	5.46%		5.76%
Allowance for Loans Losses and Unfunded Commitments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (5,130)		$ (17,709)
Financing Receivable, Allowance for Credit Loss, Recovery	2,021		5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(3,109)		(12,062)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	98,486	$ 94,613	94,613
Financing Receivable, Allowance for Credit Loss, Writeoff	(5,130)		(17,709)
Financing Receivable, Allowance for Credit Loss, Recovery	2,021		5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(3,109)		(12,062)
Provision for Loan, Lease, and Other Losses	(33)		15,935
Balance at end of period	$ 95,344		$ 98,486
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	0.88%		0.91%