Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Cash and cash equivalents, Carrying Amount	$ 222,738	$ 230,933	$ 180,047	$ 228,110
Investment securities, Carrying Amount	427,591	441,534
Loans, net, Carrying Amount	756,875	711,362
Accrued interest receivable, Carrying Amount	6,535	7,069
Assets, Carrying Amount	1,413,739	1,390,898
Cash and cash equivalents, Fair Value	222,738	230,933
Investment securities, Fair Value	427,591	441,534
Loans, net, Fair Value	769,487	711,090
Accrued interest receivable, Fair Value	6,535	7,069
Assets, Fair Value	1,426,351	1,390,626
Deposits, Carrying Amount	711,233	721,926
Accounts and drafts payable, Carrying Amount	762,075	694,360
Accrued interest payable, Carrying Amount	247	91
Liabilities, Carrying Amount	1,473,555	1,416,377
Deposits, Fair Value	711,717	722,018
Accounts and drafts payable, Fair Value	762,075	694,360
Accrued interest payable, Fair Value	247	91
Liabilities, Fair Value	$ 1,474,039	$ 1,416,469