Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Cash Flows [Abstract]
Net cash from operating activities	$ 25,554	$ 12,905
Cash flows used for investing activities:
Maturities and calls of securities, available-for-sale	16,987	12,396
Purchases of securities, available-for-sale	(20,901)	(27,749)
Sale of securities available for sale	0	17,570
Redemption of other securities		741
Sale of equity securities	247
Purchase of bank owned life insurance		(955)
Net loan originations	(34,044)	(10,988)
Proceeds from sale of premises and equipment	10
Premises and equipment purchases	(135)	(216)
Net cash used for investing activities	(37,836)	(9,201)
Cash flows from financing activities:
Net change in short-term FHLB advances	(84,500)	(66,500)
Increase in deposits	313,175	185,908
Increase (decrease) in securities sold under repurchase agreements	4,025	(229)
Purchase of treasury shares	(11,095)
Common dividends paid	(1,835)	(1,404)
Preferred dividends paid		(164)
Net cash provided by financing activities	219,770	117,611
Increase in cash and due from financial institutions	207,488	121,315
Cash and due from financial institutions at beginning of period	48,535	42,779
Cash and due from financial institutions at end of period	256,023	164,094
Cash paid during the period for:
Interest	2,885	2,834
Supplemental cash flow information:
Change in fair value of swap asset	(14,085)	(2,073)
Change in fair value of swap asset liability	$ 14,085	2,073
Securities purchased not settled		1,061
Increase in right-of-use asset on leases		(2,201)
Increase in lease liability		$ 2,201