Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Securities available-for-sale	$ 385,079	$ 206,335
Securities held-to-maturity	109,821	94,953
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and cash equivalents	344,092	122,403
Securities available-for-sale	30,003
Significant Other Observable Inputs (Level 2)
Assets
Securities available-for-sale	355,076	206,335
Securities held-to-maturity	109,821	94,953
Loans (including loans held-for-sale), net	7,297	1,172
Accrued interest receivable	1,654	1,435
I/O strips receivables	1,367	1,481
Liabilities
Time deposits	245,279	256,589
Other deposits	1,817,914	1,132,163
Short-term borrowings	3,000
Accrued interest payable	195	201
Significant Unobservable Inputs (Level 3)
Assets
Loans (including loans held-for-sale), net	1,337,939	1,071,854
Accrued interest receivable	3,389	3,609
Carrying amount
Assets
Cash and cash equivalents	344,092	122,403
Securities available-for-sale	385,079	206,335
Securities held-to-maturity	109,311	95,362
Loans (including loans held-for-sale), net	1,347,087	1,071,436
FHLB and FRB stock and other investments	12,694	10,598
Accrued interest receivable	5,043	5,044
I/O strips receivables	1,367	1,481
Liabilities
Time deposits	244,861	256,223
Other deposits	1,817,914	1,132,163
Short-term borrowings	3,000
Accrued interest payable	195	201
Carried at fair value
Assets
Cash and cash equivalents	344,092	122,403
Securities available-for-sale	385,079	206,335
Securities held-to-maturity	109,821	94,953
Loans (including loans held-for-sale), net	1,345,236	1,073,026
Accrued interest receivable	5,043	5,044
I/O strips receivables	1,367	1,481
Liabilities
Time deposits	245,279	256,589
Other deposits	1,817,914	1,132,163
Short-term borrowings	3,000
Accrued interest payable	$ 195	$ 201