Fair Value (Details) - Financial Instruments - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets:
Cash and due from banks	$ 174,268	$ 155,055
Interest-bearing deposits in other banks	74,892	107,093
Securities held-to-maturity, at amortized cost	17,742	22,291
FHLB and FRB stock	46,306	59,131
Loans	9,966,207	8,168,062
Investment in BOLI	276,960	219,746
Liabilities:
Deposits	10,956,541	8,828,603
Borrowed funds	547,923	879,008
Senior and subordinated debt	194,745	194,603
Level 1
Assets:
Cash and due from banks	174,268	155,055
Level 2
Assets:
Interest-bearing deposits in other banks	74,892	107,093
Securities held-to-maturity, at amortized cost	15,118	18,212
FHLB and FRB stock	46,306	59,131
Liabilities:
Deposits	10,945,331	8,820,572
Borrowed funds	547,923	879,008
Senior and subordinated debt	202,522	197,888
Accrued interest payable	2,564	3,416
Level 3
Assets:
Loans	9,712,763	7,973,845
Investment in BOLI	276,960	219,746
Accrued interest receivable	39,868	34,384
Other interest-earning assets	635	834
Carrying Amount | Level 1
Assets:
Cash and due from banks	174,268	155,055
Carrying Amount | Level 2
Assets:
Interest-bearing deposits in other banks	74,892	107,093
Securities held-to-maturity, at amortized cost	17,742	22,291
FHLB and FRB stock	46,306	59,131
Liabilities:
Deposits	10,956,541	8,828,603
Borrowed funds	547,923	879,008
Senior and subordinated debt	194,745	194,603
Accrued interest payable	2,564	3,416
Carrying Amount | Level 3
Assets:
Loans	9,970,427	8,172,584
Investment in BOLI	276,960	219,746
Accrued interest receivable	39,868	34,384
Other interest-earning assets	$ 635	$ 834