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Fair Value Measurements (Carrying Amount, Estimated Fair Value, And Placement In Fair Value Hierarchy 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]    
Securities available for sale $ 853,437 $ 823,796
Carrying Amount [Member] | Level 1 Inputs [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 84,791 60,436
Accrued interest receivable 9,009 7,843
Non-maturity deposits 1,771,959 1,606,856
Short-term borrowings 139,620 179,806
Accrued interest payable 3,868 3,819
Carrying Amount [Member] | Level 2 Inputs [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 853,437 823,796
Securities held to maturity 17,747 17,905
Loans held for sale 2,142 1,518
Loans 1,686,975 1,678,648
FHLB and FRB stock 10,566 12,321
Time deposits 637,538 654,938
Carrying Amount [Member] | Level 3 Inputs [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 4,488 [1] 2,364 [1]
Estimated Fair Value [Member] | Level 1 Inputs [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 84,791 60,436
Accrued interest receivable 9,009 7,843
Non-maturity deposits 1,771,959 1,606,856
Short-term borrowings 139,620 179,806
Accrued interest payable 3,868 3,819
Estimated Fair Value [Member] | Level 2 Inputs [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 853,437 823,796
Securities held to maturity 18,260 18,478
Loans held for sale 2,158 1,547
Loans 1,707,696 1,701,419
FHLB and FRB stock 10,566 12,321
Time deposits 640,438 658,342
Estimated Fair Value [Member] | Level 3 Inputs [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans $ 4,488 [1] $ 2,364 [1]
[1] Comprised of collateral dependent impaired loans.