Condensed Parent Company Statements - Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Condensed Balance Sheet Statements, Captions [Line Items]
Cash	$ 90,008	$ 92,403
Prepaid expenses and other assets	45,176	58,889
Total assets	5,449,944	5,526,420
Subordinated debentures issued to capital trust	73,984	148,397
Subordinated notes	73,984	148,397
Additional paid-in capital	38,314	35,004
Retained earnings	545,548	541,448
Accumulated other comprehensive income	32,759	53,151
Total liabilities and stockholders' equity	5,449,944	5,526,420
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash	48,372	111,250
Investment in subsidiary bank	672,342	698,398
Deferred and accrued income taxes	94	157
Prepaid expenses and other assets	868	883
Total assets	721,676	810,688
Accounts payable and accrued expenses	5,166	6,776
Subordinated debentures issued to capital trust	25,774	25,774
Subordinated notes	73,984	148,397
Common Stock	131	138
Additional paid-in capital	38,314	35,004
Retained earnings	545,548	541,448
Accumulated other comprehensive income	32,759	53,151
Total liabilities and stockholders' equity	$ 721,676	$ 810,688