Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025		Mar. 31, 2024		Dec. 31, 2024
Segment Reporting Information [Line Items]
Interest income	$ 229,147		$ 229,840
Interest expense	77,092		97,010
Funds transfer pricing, net	0		0
Net Interest Income	152,055		132,830
PCL	5,294		7,516
Net Interest Income After PCL	146,761		125,314
Service charges on deposit accounts	10,636		10,958
Bank card and other fees	7,664		7,428
Mortgage banking, net	8,771		8,915
Wealth management	9,543		8,952
Other, net	5,970		3,102
Internal allocations	0		0
Total Noninterest Income (loss)	42,584		39,355
Salaries and employee benefits	68,492		65,487
Services and fees	26,247		24,431
Other segment expenses	29,272	[1]	29,746	[2]
Internal allocations	0		0
Total Noninterest Expense	124,011		119,664
Income (Loss) From Continuing Operations Before Income Taxes	65,334		45,005
Income taxes from continuing operations	11,701		6,832
Income (Loss) From Continuing Operations	53,633		38,173
Selected Financial Information
Total assets	18,296,203				$ 18,152,422
Depreciation and amortization	8,571		8,563
Continuing Operations [Member]
Selected Financial Information
Total assets	18,296,203		18,303,519
Depreciation and amortization	8,571		8,429
General Banking [Member]
Segment Reporting Information [Line Items]
Interest income	226,158		227,571
Interest expense	76,297		96,502
Funds transfer pricing, net	460		445
Net Interest Income	150,321		131,514
PCL	5,297		7,348
Net Interest Income After PCL	145,024		124,166
Service charges on deposit accounts	10,615		10,936
Bank card and other fees	7,625		7,392
Mortgage banking, net	8,771		8,915
Wealth management	181		189
Other, net	5,822		2,966
Internal allocations	(96)		(94)
Total Noninterest Income (loss)	33,014		30,398
Salaries and employee benefits	62,871		60,103
Services and fees	25,599		23,739
Other segment expenses	28,847	[1]	29,287	[2]
Internal allocations	(1,482)		(1,456)
Total Noninterest Expense	115,835		111,673
Income (Loss) From Continuing Operations Before Income Taxes	62,203		42,891
Income taxes from continuing operations	10,922		6,309
Income (Loss) From Continuing Operations	51,281		36,582
Selected Financial Information
Total assets	18,098,364		18,125,354
Depreciation and amortization	8,509		8,367
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	2,989		2,269
Interest expense	795		508
Funds transfer pricing, net	(460)		(445)
Net Interest Income	1,734		1,316
PCL	(3)		168
Net Interest Income After PCL	1,737		1,148
Service charges on deposit accounts	21		22
Bank card and other fees	39		36
Mortgage banking, net	0		0
Wealth management	9,362		8,763
Other, net	148		136
Internal allocations	96		94
Total Noninterest Income (loss)	9,570		8,957
Salaries and employee benefits	5,621		5,384
Services and fees	648		692
Other segment expenses	425	[1]	459	[2]
Internal allocations	1,482		1,456
Total Noninterest Expense	8,176		7,991
Income (Loss) From Continuing Operations Before Income Taxes	3,131		2,114
Income taxes from continuing operations	779		523
Income (Loss) From Continuing Operations	2,352		1,591
Selected Financial Information
Total assets	197,839		178,165
Depreciation and amortization	62		62
Internal Allocations [Member] | General Banking [Member]
Segment Reporting Information [Line Items]
Other, net	5,918		3,060
Internal Allocations [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Other, net	$ 52		$ 42

[1] (1) Other segment expenses for the General Banking Segment include net occupancy-premises, equipment 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.

[2] (1) Other segment expenses for the General Banking Segment include net occupancy-premises, equipment 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.