Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement Of Cash Flows [Abstract]
Net cash from operating activities	$ 5,324	$ 8,223
Cash flows used for investing activities:
Maturities and calls of securities, available-for-sale	9,332	15,385
Purchases of securities, available-for-sale	(14,606)	(48,444)
Purchases of other securities		(170)
Net loan originations	(15,382)	(45,318)
Proceeds from sale of other real estate owned properties	34	72
Proceeds from sale of premises and equipment	238	139
Premises and equipment purchases	(292)	(535)
Net cash used for investing activities	(20,676)	(78,871)
Cash flows from financing activities:
Repayment of long-term FHLB advances	(10,000)	(2,500)
Net change in short-term FHLB advances	94,300	17,300
Increase (decrease) in deposits	(58,751)	43,785
Decrease in securities sold under repurchase agreements	(7,525)	(16,195)
Net proceeds from common stock issuance		32,821
Common dividends paid	(1,433)	(1,116)
Preferred dividends paid	(602)	(627)
Net cash provided by financing activities	15,989	73,468
Increase in cash and due from financial institutions	637	2,820
Cash and due from financial institutions at beginning of period	40,519	36,695
Cash and due from financial institutions at end of period	41,156	39,515
Cash paid during the period for:
Interest	2,854	1,740
Income taxes	1,500	2,600
Supplemental cash flow information:
Transfer of loans from portfolio to other real estate owned		78
Transfer of premises to held-for-sale		3
Transfer of loans held for sale to portfolio	85	419
Conversion of preferred shares to common shares	4,108	1,382
Securities purchased not settled	$ 855	$ 1,073