Fair Value Measurements (Details 7) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair values of defined benefit pension plan assets by category of the firm
Securities held to maturity	$ 348,340	$ 317,766
Securities available for sale	398,190	356,311
Mortgage loans held for sale	50,268	34,845
Loans covered under loss-share agreements	201,494	237,088
FDIC loss-share indemnification asset	30,698	44,153
Mortgage servicing rights	7,181	4,233
Carrying Value [Member]
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	79,015	132,420
Securities held to maturity	348,340	317,766
Securities available for sale	398,190	356,311
Mortgage loans held for sale	50,268	34,845
Loans covered under loss-share agreements	201,494	237,088
Loans not covered under loss-share agreements, net	2,635,983	2,528,818
FDIC loss-share indemnification asset	30,698	44,153
Mortgage servicing rights	7,181	4,233
Derivative instruments	6,509	4,654
Financial liabilities
Deposits	3,505,158	3,461,221
Short-term borrowings	42,819	5,254
Federal Home Loan Bank advances	77,441	83,843
Junior subordinated debentures	75,529	75,609
Derivative instruments	2,664	5,514
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	79,015	132,420
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	2,287,104	2,268,568
Short-term borrowings	42,819	5,254
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Derivative instruments	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	0	0
Securities held to maturity	347,155	334,475
Securities available for sale	382,230	341,243
Mortgage loans held for sale	50,268	34,845
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	6,509	4,654
Financial liabilities
Deposits	1,223,615	1,200,785
Short-term borrowings	0	0
Federal Home Loan Bank advances	91,663	99,870
Junior subordinated debentures	24,692	27,985
Derivative instruments	2,664	5,514
Significant Unobservable Inputs (Level 3) [Member]
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Securities available for sale	15,960	15,068
Mortgage loans held for sale	0	0
Loans covered under loss-share agreements	200,057	235,890
Loans not covered under loss-share agreements, net	2,572,710	2,452,937
FDIC loss-share indemnification asset	30,698	44,153
Mortgage servicing rights	7,723	4,259
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 [Member]
Fair values of defined benefit pension plan assets by category of the firm
Cash and cash equivalents	79,015	132,420
Securities held to maturity	347,155	334,475
Securities available for sale	398,190	356,311
Mortgage loans held for sale	50,268	34,845
Loans covered under loss-share agreements	200,057	235,890
Loans not covered under loss-share agreements, net	2,572,710	2,452,937
FDIC loss-share indemnification asset	30,698	44,153
Mortgage servicing rights	7,723	4,259
Derivative instruments	6,509	4,654
Financial liabilities
Deposits	3,510,719	3,469,353
Short-term borrowings	42,819	5,254
Federal Home Loan Bank advances	91,663	99,870
Junior subordinated debentures	24,692	27,985
Derivative instruments	$ 2,664	$ 5,514

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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