Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Cash and cash equivalents, Carrying Amount	$ 274,133	$ 253,172	$ 158,611	$ 294,335
Investment securities, Carrying Amount	368,041	375,696
Loans, net, Carrying Amount	687,462	647,420
Accrued interest receivable, Carrying Amount	6,345	6,647
Assets, Carrying Amount	1,335,981	1,282,935
Cash and cash equivalents, Fair Value	274,133	253,172
Investment securities, Fair Value	368,041	375,696
Loans, net, Fair Value	688,697	649,161
Accrued interest receivable, Fair Value	6,345	6,647
Assets, Fair Value	1,337,216	1,284,676
Deposits, Carrying Amount	630,995	646,484
Accounts and drafts payable, Carrying Amount	650,988	577,259
Accrued interest payable, Carrying Amount	43	35
Liabilities, Carrying Amount	1,282,026	1,223,778
Deposits, Fair Value	631,360	646,892
Accounts and drafts payable, Fair Value	650,988	577,259
Accrued interest payable, Fair Value	43	35
Liabilities, Fair Value	$ 1,282,391	$ 1,224,186