Fair Value Measurements - (Details 7) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financial assets
Securities held to maturity	$ 362,319	$ 458,400
Securities available for sale	677,638	646,805
Mortgage loans held for sale	189,965	225,254
Acquired and covered by FDIC loss-share agreements (acquired covered loans)	30,533	93,142
FDIC loss-share indemnification asset	4,053	7,149
Mortgage servicing rights	22,125	29,642
Level 1
Financial assets
Cash and cash equivalents	217,391	211,571
Securities held to maturity	0	0
Securities available for sale	0	0
Mortgage loans held for sale	0	0
Acquired and covered by FDIC loss-share agreements (acquired covered loans)	0	0
Loans not covered under loss-share agreements, net	0	0
FDIC loss-share indemnification asset	0	0
Mortgage servicing rights	0	0
Derivative instruments	0	0
Financial liabilities
Deposits	5,190,976	4,723,312
Short-term borrowings	266,943	422,279
Other long-term borrowings	158	192
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Subordinated notes	0
Derivative instruments	0	0
Level 2
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	381,950	473,753
Securities available for sale	659,546	627,336
Mortgage loans held for sale	189,965	225,254
Acquired and covered by FDIC loss-share agreements (acquired covered loans)	0	0
Loans not covered under loss-share agreements, net	0	0
FDIC loss-share indemnification asset	0	0
Mortgage servicing rights	0	0
Derivative instruments	12,662	7,498
Financial liabilities
Deposits	1,631,027	1,502,202
Short-term borrowings	0	0
Other long-term borrowings	0	0
Federal Home Loan Bank advances	9,363	56,101
Junior subordinated debentures	73,301	78,095
Subordinated notes	102,500
Derivative instruments	12,683	7,319
Level 3
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Securities available for sale	18,092	19,469
Mortgage loans held for sale	0	0
Acquired and covered by FDIC loss-share agreements (acquired covered loans)	30,704	92,528
Loans not covered under loss-share agreements, net	6,016,370	5,208,630
FDIC loss-share indemnification asset	4,053	7,149
Mortgage servicing rights	22,606	33,283
Derivative instruments	0	0
Financial liabilities
Deposits	0	0
Short-term borrowings	0	0
Other long-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Subordinated notes	0
Derivative instruments	0	0
Carrying Value
Financial assets
Cash and cash equivalents	217,391	211,571
Securities held to maturity	362,319	458,400
Securities available for sale	677,638	646,805
Mortgage loans held for sale	189,965	225,254
Acquired and covered by FDIC loss-share agreements (acquired covered loans)	30,533	93,142
Loans not covered under loss-share agreements, net	6,028,776	5,277,883
FDIC loss-share indemnification asset	4,053	7,149
Mortgage servicing rights	22,125	29,642
Derivative instruments	12,662	7,498
Financial liabilities
Deposits	6,817,798	6,218,602
Short-term borrowings	266,943	422,279
Other long-term borrowings	158	192
Federal Home Loan Bank advances	8,807	52,930
Junior subordinated debentures	95,506	95,095
Subordinated notes	98,167
Derivative instruments	12,683	7,319
Fair Value
Financial assets
Cash and cash equivalents	217,391	211,571
Securities held to maturity	381,950	473,753
Securities available for sale	677,638	646,805
Mortgage loans held for sale	189,965	225,254
Acquired and covered by FDIC loss-share agreements (acquired covered loans)	30,704	92,528
Loans not covered under loss-share agreements, net	6,016,370	5,208,630
FDIC loss-share indemnification asset	4,053	7,149
Mortgage servicing rights	22,606	33,283
Derivative instruments	12,662	7,498
Financial liabilities
Deposits	6,822,003	6,225,514
Short-term borrowings	266,943	422,279
Other long-term borrowings	158	192
Federal Home Loan Bank advances	9,363	56,101
Junior subordinated debentures	73,301	78,095
Subordinated notes	102,500
Derivative instruments	$ 12,683	$ 7,319