Parent Only Condensed Financial Statements - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 65,556	$ 72,439
Other assets	45,915	50,564
Total assets	2,593,819	2,522,502
Liabilities:
Other liabilities	35,504	25,912
Subordinated debentures, net	34,945	34,767
Total liabilities	2,284,534	2,249,478
Shareholders' equity
Common stock	113,179	112,507
Retained earnings	186,867	164,117
Accumulated other comprehensive income, net of taxes	5,932	(6,666)
Total shareholders' equity	309,285	273,024	$ 255,942	$ 205,878
Total liabilities and shareholder's equity	2,593,819	2,522,502
Parent [Member]
ASSETS
Cash and due from banks	4,818	2,338
Other assets	21	20
Total assets	345,433	308,995
Liabilities:
Other liabilities	1,203	1,204
Subordinated debentures, net	34,945	34,767
Total liabilities	36,148	35,971
Shareholders' equity
Common stock	116,486	115,573
Retained earnings	186,867	164,117
Accumulated other comprehensive income, net of taxes	5,932	(6,666)
Total shareholders' equity	309,285	273,024
Total liabilities and shareholder's equity	345,433	308,995
Parent [Member] | Trust Subsidiaries [Member]
ASSETS
Investments in bank subsidiary	1,145	1,145
Parent [Member] | Subsidiaries [Member]
ASSETS
Investments in bank subsidiary	$ 339,449	$ 305,492