Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Securities available-for-sale	$ 390,435	$ 385,079
Securities held-to-maturity	214,624	109,821
Carrying amount
Assets
Cash and cash equivalents	158,844	344,092
Securities available-for-sale	390,435	385,079
Securities held-to-maturity	210,170	109,311
Loans (including loans held-for-sale), net	1,449,072	1,347,087
FHLB and FRB stock and other investments	15,190	12,694
Accrued interest receivable	6,483	5,924
I/O strips receivables	1,154	1,367
Liabilities
Time deposits	254,022	244,861
Other deposits	1,819,762	1,817,914
Short-term borrowings		3,000
Accrued interest payable	176	170
Carried at fair value
Assets
Cash and cash equivalents	158,844	344,092
Securities available-for-sale	390,435	385,079
Securities held-to-maturity	189,184	109,821
Loans (including loans held-for-sale), net	1,529,278	1,345,236
Accrued interest receivable	6,483	5,924
I/O strips receivables	1,154	1,367
Liabilities
Time deposits	254,373	245,279
Other deposits	1,819,762	1,817,914
Short-term borrowings		3,000
Accrued interest payable	176	170
Carried at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and cash equivalents	158,844	344,092
Securities available-for-sale		30,003
Accrued interest receivable		14
Carried at fair value | Significant Other Observable Inputs (Level 2)
Assets
Securities available-for-sale	390,435	355,076
Securities held-to-maturity	189,184	109,821
Loans (including loans held-for-sale), net	4,879	7,297
Accrued interest receivable	1,928	1,640
I/O strips receivables	1,154	1,367
Liabilities
Time deposits	254,373	245,279
Other deposits	1,819,762	1,817,914
Short-term borrowings		3,000
Accrued interest payable	176	170
Carried at fair value | Significant Unobservable Inputs (Level 3)
Assets
Loans (including loans held-for-sale), net	1,524,399	1,337,939
Accrued interest receivable	$ 4,555	$ 4,270