Fair Value (Details) - Financial Instruments - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets:
Cash and due from banks	$ 149,957	$ 114,587
Interest-bearing deposits in other banks	105,432	266,615
Securities held-to-maturity, at amortized cost	20,672	23,152
FHLB and FRB stock	44,506	39,306
Loans	7,899,432	7,088,085
Investment in BOLI	218,133	209,601
Liabilities:
Deposits	8,971,316	8,097,738
Senior and subordinated debt	162,876	201,208
Level 1
Assets:
Cash and due from banks	149,957	114,587
Liabilities:
Senior and subordinated debt	164,753	205,726
Level 2
Assets:
Interest-bearing deposits in other banks	105,432	266,615
Securities held-to-maturity, at amortized cost	18,394	20,054
FHLB and FRB stock	44,506	39,306
Liabilities:
Deposits	8,973,012	8,093,640
Borrowed funds	449,744	165,096
Accrued interest payable	2,309	2,175
Level 3
Assets:
Loans	7,846,563	6,959,024
Investment in BOLI	218,133	209,601
Accrued interest receivable	30,167	27,847
Other interest-earning assets	1,307	1,982
Carrying Amount | Level 1
Assets:
Cash and due from banks	149,957	114,587
Liabilities:
Senior and subordinated debt	162,876	201,208
Carrying Amount | Level 2
Assets:
Interest-bearing deposits in other banks	105,432	266,615
Securities held-to-maturity, at amortized cost	20,672	23,152
FHLB and FRB stock	44,506	39,306
Liabilities:
Deposits	8,971,316	8,097,738
Borrowed funds	449,744	165,096
Accrued interest payable	2,309	2,175
Carrying Amount | Level 3
Assets:
Loans	7,905,390	7,091,988
Investment in BOLI	218,133	209,601
Accrued interest receivable	30,167	27,847
Other interest-earning assets	$ 1,307	$ 1,982