Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income	$ 552,878	$ 494,708	$ 418,351
PCL	24,581	22,892	(24,448)
Noninterest income	206,958	205,144	221,910
Noninterest expense	537,919	603,213	489,296
Income Before Income Taxes	197,336	73,747	175,413
Income taxes	31,847	1,860	28,048
Net Income	165,489	71,887	147,365
Selected Financial Information
Total assets	18,722,189	18,015,478	17,595,636
Depreciation and amortization	35,756	39,882	45,813
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	547,010	489,398	413,201
PCL	26,716	22,913	(24,439)
Noninterest income	113,497	116,350	137,874
Noninterest expense	463,496	531,397	421,561
Income Before Income Taxes	170,295	51,438	153,953
Income taxes	25,091	(3,683)	22,706
Net Income	145,204	55,121	131,247
Selected Financial Information
Total assets	18,440,198	17,710,673	17,275,438
Depreciation and amortization	34,924	38,909	44,776
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	5,879	5,321	5,161
PCL	(2,135)	(21)	(9)
Noninterest income	34,936	35,072	35,420
Noninterest expense	32,339	32,873	31,721
Income Before Income Taxes	10,611	7,541	8,869
Income taxes	2,653	1,870	2,219
Net Income	7,958	5,671	6,650
Selected Financial Information
Total assets	185,342	214,313	232,997
Depreciation and amortization	261	288	269
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	(11)	(11)	(11)
Noninterest income	58,525	53,722	48,616
Noninterest expense	42,084	38,943	36,014
Income Before Income Taxes	16,430	14,768	12,591
Income taxes	4,103	3,673	3,123
Net Income	12,327	11,095	9,468
Selected Financial Information
Total assets	96,649	90,492	87,201
Depreciation and amortization	$ 571	$ 685	$ 768