Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Cash and cash equivalents, Carrying Amount	$ 158,611	$ 294,335	$ 181,723	$ 225,262
Investment securities, Carrying Amount	347,820	356,141
Loans, net, Carrying Amount	663,265	657,452
Accrued interest receivable, Carrying Amount	5,951	6,521
Assets, Carrying Amount	1,175,647	1,314,449
Cash and cash equivalents, Fair Value	158,611	294,335
Investment securities, Fair Value	347,820	356,141
Loans, net, Fair Value	670,353	663,247
Accrued interest receivable, Fair Value	5,951	6,521
Assets, Fair Value	1,182,735	1,320,244
Deposits	555,410	618,199
Accounts and drafts payable	584,532	655,428
Accrued interest payable, Carrying Amount	55	57
Liabilities, Carrying Amount	1,139,997	1,273,684
Deposits, Fair Value	555,823	618,199
Accounts and drafts payable, Fair Value	584,532	655,428
Accrued interest payable, Fair Value	55	57
Liabilities, Fair Value	$ 1,140,410	$ 1,273,684