Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 102,336	$ 103,952
Provision for credit losses	(10,501)	20,581
Noninterest income	60,583	65,264
Noninterest expense	112,181	123,810
Income Before Income Taxes	61,239	24,825
Income taxes	9,277	2,607
Net Income	51,962	22,218
Selected Financial Information
Total assets	16,878,313	14,019,829	$ 16,551,840
Depreciation and amortization	11,126	8,996
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	101,108	102,403
Provision for credit losses	(10,499)	18,374
Noninterest income	39,652	45,176
Noninterest expense	94,597	106,450
Income Before Income Taxes	56,662	22,755
Income taxes	8,123	2,091
Net Income	48,539	20,664
Selected Financial Information
Total assets	16,555,481	13,663,877
Depreciation and amortization	10,864	8,794
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	1,231	1,504
Provision for credit losses	(2)	2,207
Noninterest income	8,463	8,516
Noninterest expense	8,194	8,516
Income Before Income Taxes	1,502	(703)
Income taxes	376	(176)
Net Income	1,126	(527)
Selected Financial Information
Total assets	243,132	280,181
Depreciation and amortization	68	67
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	(3)	45
Noninterest income	12,468	11,572
Noninterest expense	9,390	8,844
Income Before Income Taxes	3,075	2,773
Income taxes	778	692
Net Income	2,297	2,081
Selected Financial Information
Total assets	79,700	75,771
Depreciation and amortization	$ 194	$ 135