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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities $ 36,897 $ 40,381
Loans, net of allowance of loan losses 2,293,906 2,263,130
Time deposits 861,952 870,232
Federal Home Loan Bank advances 341,218 361,172
Junior subordinated debentures 32,991 32,991
Loan servicing rights reserve 150 165
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 36,897 40,381
Loans, net of allowance of loan losses 2,293,906 2,263,130
Loan servicing rights 1,397 [1] 1,110 [2]
Time deposits 861,952 870,232
Federal Home Loan Bank advances 341,218 361,172
Junior subordinated debentures 32,991 32,991
Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held to maturity securities 37,804 41,420
Loans, net of allowance of loan losses 2,367,869 2,350,153
Loan servicing rights 1,547 [1] 1,275 [2]
Time deposits 871,881 879,705
Federal Home Loan Bank advances 371,078 392,805
Junior subordinated debentures 23,113 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 37,804 41,420
Loans, net of allowance of loan losses 0 0
Loan servicing rights 0 [1] 0 [2]
Time deposits 871,881 879,705
Federal Home Loan Bank advances 371,078 392,805
Junior subordinated debentures 23,113 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 2,367,869 2,350,153
Loan servicing rights 1,547 [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 $150 thousand in reserves as of March 31, 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.