Fair Value (Details) - Fair Value Measurements of Other Financial Instruments - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Cash and due from banks	$ 155,055	$ 114,587
Interest-bearing deposits in other banks	107,093	266,615
Securities held-to-maturity	22,291	23,152
FHLB and FRB stock	59,131	39,306
Loans	8,168,062	7,088,085
Investment in BOLI	219,746	209,601
Liabilities:
Deposits	8,828,603	8,097,738
Borrowed funds	879,008	165,096
Senior and subordinated debt	194,603	201,208
Level 1
Assets:
Cash and due from banks	155,055	114,587
Level 1 | Carrying Amount
Assets:
Cash and due from banks	155,055	114,587
Level 2
Assets:
Interest-bearing deposits in other banks	107,093	266,615
Securities held-to-maturity	18,212	20,054
FHLB and FRB stock	59,131	39,306
Liabilities:
Deposits	8,820,572	8,093,640
Borrowed funds	879,008	165,096
Senior and subordinated debt	197,888	205,726
Accrued interest payable	3,416	2,175
Level 2 | Carrying Amount
Assets:
Interest-bearing deposits in other banks	107,093	266,615
Securities held-to-maturity	22,291	23,152
FHLB and FRB stock	59,131	39,306
Liabilities:
Deposits	8,828,603	8,097,738
Borrowed funds	879,008	165,096
Senior and subordinated debt	194,603	201,208
Accrued interest payable	3,416	2,175
Level 3
Assets:
Loans	7,973,845	6,959,024
Investment in BOLI	219,746	209,601
Accrued interest receivable	34,384	27,847
Other interest-earning assets	834	1,982
Level 3 | Carrying Amount
Assets:
Loans	8,172,584	7,091,988
Investment in BOLI	219,746	209,601
Accrued interest receivable	34,384	27,847
Other interest-earning assets	$ 834	$ 1,982