Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Interest income		$ 960,330	$ 878,832	$ 541,833
Interest expense		375,909	325,954	47,125
Funds transfer pricing, net		0	0	0
Net Interest Income		584,421	552,878	494,708
PCL		41,255	24,581	22,892
Net Interest Income After PCL		543,166	528,297	471,816
Service charges on deposit accounts		44,382	43,416	42,157
Bank card and other fees		33,301	33,439	36,105
Mortgage banking, net		26,626	26,216	28,306
Wealth management		37,251	35,092	35,013
Other, net		17,813	10,231	9,841
Securities gains (losses), net		(182,792)	39	0
Internal allocations		0	0	0
Total Noninterest Income (loss)		(23,419)	148,433	151,422
Salaries and employee benefits		266,239	268,270	254,247
Services and fees		101,590	107,805	103,893
Other segment expenses	[1]	117,861	119,621	205,993
Internal allocations		0	0	0
Total Noninterest Expense		485,690	495,696	564,133
Income from continuing operations before income taxes		34,057	181,034	59,105
Income taxes		(11,153)	27,744	(1,813)
Income From Continuing Operations		45,210	153,290	60,918
Selected Financial Information
Total assets		18,152,422	18,722,189
Depreciation and amortization		38,067	35,756	39,882
Continuing Operations [Member]
Selected Financial Information
Total assets		18,152,422	18,654,555	17,939,266
Depreciation and amortization		37,849	35,185	39,197
General Banking [Member]
Segment Reporting Information [Line Items]
Interest income		949,600	869,143	534,531
Interest expense		373,369	324,470	47,044
Funds transfer pricing, net		2,231	2,326	1,900
Net Interest Income		578,462	546,999	489,387
PCL		41,101	26,716	22,913
Net Interest Income After PCL		537,361	520,283	466,474
Service charges on deposit accounts		44,295	43,329	42,073
Bank card and other fees		33,148	33,382	36,058
Mortgage banking, net		26,626	26,216	28,306
Wealth management		748	838	639
Other, net		17,243	9,693	9,274
Securities gains (losses), net		(182,792)	39	0
Internal allocations		(377)	(376)	(39)
Total Noninterest Income (loss)		(60,732)	113,497	116,350
Salaries and employee benefits		243,930	247,014	232,720
Services and fees		98,833	104,432	100,397
Other segment expenses	[1]	116,080	117,757	204,097
Internal allocations		(5,897)	(5,846)	(5,954)
Total Noninterest Expense		452,946	463,357	531,260
Income from continuing operations before income taxes		23,683	170,423	51,564
Income taxes		(13,726)	25,091	(3,683)
Income From Continuing Operations		37,409	145,332	55,247
Selected Financial Information
Total assets		17,938,268	18,469,213	17,724,953
Depreciation and amortization		37,599	34,924	38,909
General Banking [Member] | Internal Allocations [Member]
Segment Reporting Information [Line Items]
Other, net		17,620	10,069	9,313
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income		10,730	9,689	7,302
Interest expense		2,540	1,484	81
Funds transfer pricing, net		(2,231)	(2,326)	(1,900)
Net Interest Income		5,959	5,879	5,321
PCL		154	(2,135)	(21)
Net Interest Income After PCL		5,805	8,014	5,342
Service charges on deposit accounts		87	87	84
Bank card and other fees		153	57	47
Mortgage banking, net		0	0	0
Wealth management		36,503	34,254	34,374
Other, net		570	538	567
Securities gains (losses), net		0	0	0
Internal allocations		377	376	39
Total Noninterest Income (loss)		37,313	34,936	35,072
Salaries and employee benefits		22,309	21,256	21,527
Services and fees		2,757	3,373	3,496
Other segment expenses	[1]	1,781	1,864	1,896
Internal allocations		5,897	5,846	5,954
Total Noninterest Expense		32,744	32,339	32,873
Income from continuing operations before income taxes		10,374	10,611	7,541
Income taxes		2,573	2,653	1,870
Income From Continuing Operations		7,801	7,958	5,671
Selected Financial Information
Total assets		214,154	185,342	214,313
Depreciation and amortization		250	261	288
Wealth Management [Member] | Internal Allocations [Member]
Segment Reporting Information [Line Items]
Other, net		$ 193	$ 162	$ 528

[1] (1) Other segment expenses for the General Banking Segment include net occupancy-premises, equipment expense, litigation settlement expense, FDIC assessment expense, other real estate expense, net, loan expense and other miscellaneous expense. Other segment expenses for the Wealth Management Segment include net occupancy-premises, equipment expense, FDIC assessment expense, loan expense and other miscellaneous expense.