Parent Company Financial Information (Condensed Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income
Deposits in banks	$ 955	$ 661	$ 1,312
Expense
Compensation and employee benefits	224,034	209,722	212,867
Subordinated debentures	1,932	1,871	1,871
Other borrowings	137	196	669
Other expense	23,796	26,376	26,221
Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries	256,509	192,392	241,611
Income Tax Expense (Benefit)	53,689	38,148	47,160
Net income	202,820	154,244	194,451
Parent Company
Income
Investment Income, dividend from banking subsidiary	108,000	89,000	168,000
Investment Income, dividend from other subsidiaries	500	0	0
Deposits in banks	16	13	100
Other income	36	37	68
Total Income	108,552	89,050	168,168
Expense
Compensation and employee benefits	856	758	791
Subordinated debentures	1,932	1,871	1,871
Other borrowings	52	12	0
Other expense	3,542	1,943	2,111
Total Expenses	6,382	4,584	4,773
Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries	102,170	84,466	163,395
Income Tax Expense (Benefit)	(1,329)	(952)	(967)
Income before equity in undistributed earnings of subsidiaries	103,499	85,418	164,362
Equity in undistributed earnings of subsidiaries	99,321	68,826	30,089
Net income	$ 202,820	$ 154,244	$ 194,451