Other Comprehensive Income - Changes in accumulated other comprehensive income (loss), net of tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Beginning balance	$ 1,190,681	$ 1,108,941	$ 950,438
Other comprehensive income (loss) before reclassifications	13,044	9,205	(2,035)
Amounts reclassified from accumulated other comprehensive income	503	1,971	490
Other comprehensive income (loss)	12,541	7,234	(2,525)
Ending balance	1,240,892	1,190,681	1,108,941
Securities Available For Sale
Debt Securities, Available-for-sale [Abstract]
Beginning balance	3,109	(7,044)	(3,131)
Other comprehensive income (loss) before reclassifications	14,422	11,254	(3,841)
Amounts reclassified from accumulated other comprehensive income	1,363	1,101	72
Other comprehensive income (loss)	13,059	10,153	(3,913)
Ending balance	16,168	3,109	(7,044)
Derivatives
Debt Securities, Available-for-sale [Abstract]
Beginning balance	(150)	2,769	1,381
Other comprehensive income (loss) before reclassifications	(1,378)	(2,049)	1,806
Amounts reclassified from accumulated other comprehensive income	(860)	870	418
Other comprehensive income (loss)	(518)	(2,919)	1,388
Ending balance	(668)	(150)	2,769
Accumulated Other Comprehensive Income (Loss)
Debt Securities, Available-for-sale [Abstract]
Beginning balance	2,959	(4,275)	(1,750)
Other comprehensive income (loss)	12,541	7,234
Ending balance	$ 15,500	$ 2,959	$ (4,275)