Fair Value Measurements (Details 7) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financial assets
Securities held to maturity	$ 434,705	$ 412,075
Securities available for sale	545,623	501,254
Mortgage loans held for sale	30,451	33,440
Loans covered under loss-share agreements	155,319	181,674
FDIC loss-share indemnification asset	17,033	26,273
Mortgage servicing rights	11,038	8,993
Derivative instruments	0	208
Carrying Value
Financial assets
Cash and cash equivalents	141,594	246,648
Securities held to maturity	434,705	412,075
Securities available for sale	545,623	501,254
Mortgage loans held for sale	30,451	33,440
Loans covered under loss-share agreements	155,319	181,674
Loans not covered under loss-share agreements, net	3,802,120	3,651,679
FDIC loss-share indemnification asset	17,033	26,273
Mortgage servicing rights	11,038	8,994
Derivative instruments	2,742	2,819
Financial liabilities
Deposits	4,763,670	4,841,912
Short-term borrowings	65,646	228
Federal Home Loan Bank advances	67,540	75,405
Junior subordinated debentures	94,477	94,187
Derivative instruments	3,792	3,316
Level 1
Financial assets
Cash and cash equivalents	141,594	246,648
Securities held to maturity	0	0
Securities available for sale	0	0
Mortgage loans held for sale	0	0
Loans covered under loss-share agreements	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	3,408,037	3,327,688
Short-term borrowings	65,646	2,283
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Derivative instruments	0	0
Level 2
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	444,926	408,567
Securities available for sale	526,050	483,583
Mortgage loans held for sale	30,451	33,440
Loans covered under loss-share agreements	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	2,742	2,819
Financial liabilities
Deposits	1,363,925	1,520,667
Short-term borrowings	0	0
Federal Home Loan Bank advances	131,157	80,989
Junior subordinated debentures	82,888	78,301
Derivative instruments	3,792	3,316
Level 3
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Securities available for sale	19,573	17,671
Mortgage loans held for sale	0	0
Loans covered under loss-share agreements	155,839	182,244
Loans not covered under loss-share agreements, net	3,708,781	3,590,446
FDIC loss-share indemnification asset	17,033	26,273
Mortgage servicing rights	12,159	9,840
Derivative instruments	0	0
Financial liabilities
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Derivative instruments	0	0
Fair Value
Financial assets
Cash and cash equivalents	141,594	246,648
Securities held to maturity	444,926	408,567
Securities available for sale	545,623	501,254
Mortgage loans held for sale	30,451	33,440
Loans covered under loss-share agreements	155,839	182,244
Loans not covered under loss-share agreements, net	3,708,781	3,590,446
FDIC loss-share indemnification asset	17,033	26,273
Mortgage servicing rights	12,159	9,840
Derivative instruments	2,742	2,819
Financial liabilities
Deposits	4,771,962	4,848,355
Short-term borrowings	65,646	2,283
Federal Home Loan Bank advances	131,157	80,989
Junior subordinated debentures	82,888	78,301
Derivative instruments	$ 3,792	$ 3,316