Parent Company Condensed Financial Information - Statements of Net Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]
Total Interest and Dividend Income	$ 289,262	$ 320,464	$ 320,484
Interest expense on long-term debt	458	1,201	1,831
Income tax benefit	25,325	(1)	19,126
Equity in undistributed net income (distribution in excess of net income) of:
Net Income	110,343	21,040	98,234
Parent Company
Condensed Income Statements, Captions [Line Items]
Dividends from subsidiaries	62,333	59,315	59,490
Investment income	0	0	1
Total Interest and Dividend Income	62,333	59,315	59,491
Interest expense on long-term debt	313	1,696	1,285
Other expenses	5,034	4,464	4,325
Total Expense	5,347	6,160	5,610
Income before income tax and undistributed net income of subsidiaries	56,986	53,155	53,881
Income tax benefit	(1,140)	(1,315)	(1,189)
Income before undistributed net income of subsidiaries	58,126	54,470	55,070
Equity in undistributed net income (distribution in excess of net income) of:
Bank subsidiary	57,025	(27,529)	42,683
Non-bank subsidiaries	(4,808)	(5,901)	481
Net Income	$ 110,343	$ 21,040	$ 98,234