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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities $ 33,803 $ 40,381
Loans, net of allowance of loan losses 2,357,096 2,263,130
Time deposits 811,299 870,232
Federal Home Loan Bank advances 373,341 361,172
Junior subordinated debentures 22,681 32,991
Loan servicing rights reserve 131 165
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 33,803 40,381
Loans, net of allowance of loan losses 2,357,096 2,263,130
Loan servicing rights 1,759 [1] 1,110 [2]
Time deposits 811,299 870,232
Federal Home Loan Bank advances 373,341 361,172
Junior subordinated debentures 22,681 32,991
Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 33,762 41,420
Loans, net of allowance of loan losses 2,415,177 2,350,153
Loan servicing rights 1,890 [1] 1,275 [2]
Time deposits 819,816 879,705
Federal Home Loan Bank advances 395,409 392,805
Junior subordinated debentures 14,689 23,371
Level 1 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 0 0
Loans, net of allowance of loan losses 0 0
Loan servicing rights 0 [1] 0 [2]
Time deposits 0 0
Federal Home Loan Bank advances 0 0
Junior subordinated debentures 0 0
Level 2 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 33,762 41,420
Loans, net of allowance of loan losses 0 0
Loan servicing rights 0 [1] 0 [2]
Time deposits 819,816 879,705
Federal Home Loan Bank advances 395,409 392,805
Junior subordinated debentures 14,689 23,371
Level 3 [Member] | Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 0 0
Loans, net of allowance of loan losses 2,415,177 2,350,153
Loan servicing rights 1,890 [1] 1,275 [2]
Time deposits 0 0
Federal Home Loan Bank advances 0 0
Junior subordinated debentures $ 0 $ 0
[1] The carrying value of loan servicing rights is net of $131 thousand in reserves as of June 30, 2013. The estimated fair value does not include such adjustment.
[2] The carrying value of loan servicing rights is net of $165 thousand in reserves as of December 31, 2012. The estimated fair value does not include such adjustment.