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Allowance for Loan and Lease Losses (Schedule of Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance $ 30,177 [1] $ 30,900 [1]
With an Allowance Recorded Recorded Investment 30,043 [2] 30,665 [2]
With an Allowance Recorded Related Allowance 5,181 5,349
With an Allowance Recorded Average Recorded Investment 32,998 31,260
With an Allowance Recorded Interest Income Recognized 731 [3] 1,047 [3]
With no Related Allowance Recorded Unpaid Principal Balance 11,752 [1] 29,026 [1]
With no Related Allowance Recorded Recorded Investment 10,391 [2] 25,722 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 12,494 27,264
With no Related Allowance Recorded Interest Income Recognized 89 [3] 173 [3]
Individually impaired loans Unpaid Principal Balance 41,929 [1] 59,926 [1]
Individually impaired loans Recorded Investment 40,434 [2] 56,387 [2]
Individually impaired loans Related Allowance 5,181 5,349
Individually impaired loans Average Recorded Investment 45,492 58,524
Individually impaired loans Interest Income Recognized 820 [3] 1,220 [3]
Agricultural [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 127 [1] 125 [1]
With an Allowance Recorded Recorded Investment 127 [2] 125 [2]
With an Allowance Recorded Related Allowance 3 126
With an Allowance Recorded Average Recorded Investment 335 131
With an Allowance Recorded Interest Income Recognized    [3]    [3]
With no Related Allowance Recorded Unpaid Principal Balance    [1] 345 [1]
With no Related Allowance Recorded Recorded Investment    [2] 345 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment    837
With no Related Allowance Recorded Interest Income Recognized    [3]    [3]
Commercial and industrial [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 2,901 [1] 4,580 [1]
With an Allowance Recorded Recorded Investment 2,888 [2] 4,345 [2]
With an Allowance Recorded Related Allowance 873 1,925
With an Allowance Recorded Average Recorded Investment 2,958 4,496
With an Allowance Recorded Interest Income Recognized 94 [3] 131 [3]
With no Related Allowance Recorded Unpaid Principal Balance 56 [1] 1,249 [1]
With no Related Allowance Recorded Recorded Investment 37 [2] 1,099 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 81 1,607
With no Related Allowance Recorded Interest Income Recognized    [3] 57 [3]
Consumer [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 2,854 [1] 3,411 [1]
With an Allowance Recorded Recorded Investment 2,843 [2] 3,411 [2]
With an Allowance Recorded Related Allowance 422 431
With an Allowance Recorded Average Recorded Investment 3,104 3,591
With an Allowance Recorded Interest Income Recognized 116 [3] 172 [3]
With no Related Allowance Recorded Unpaid Principal Balance 257 [1] 241 [1]
With no Related Allowance Recorded Recorded Investment 95 [2] 52 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 322 77
With no Related Allowance Recorded Interest Income Recognized    [3]    [3]
Real Estate Loans [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 24,295 [1] 22,784 [1]
With an Allowance Recorded Recorded Investment 24,185 [2] 22,784 [2]
With an Allowance Recorded Related Allowance 3,883 2,867
With an Allowance Recorded Average Recorded Investment 26,601 23,042
With an Allowance Recorded Interest Income Recognized 521 [3] 744 [3]
With no Related Allowance Recorded Unpaid Principal Balance 11,439 [1] 27,191 [1]
With no Related Allowance Recorded Recorded Investment 10,259 [2] 24,226 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 12,091 24,743
With no Related Allowance Recorded Interest Income Recognized 89 [3] 116 [3]
Real Estate Loans [Member] | 1-4 family residential construction [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance      [1]
With an Allowance Recorded Recorded Investment      [2]
With an Allowance Recorded Related Allowance     
With an Allowance Recorded Average Recorded Investment     
With an Allowance Recorded Interest Income Recognized      [3]
With no Related Allowance Recorded Unpaid Principal Balance      [1]
With no Related Allowance Recorded Recorded Investment      [2]
With no Related Allowance Recorded Related Allowance     
With no Related Allowance Recorded Average Recorded Investment     
With no Related Allowance Recorded Interest Income Recognized      [3]
Real Estate Loans [Member] | Other construction/land [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 4,513 [1] 2,972 [1]
With an Allowance Recorded Recorded Investment 4,513 [2] 2,972 [2]
With an Allowance Recorded Related Allowance 578 502
With an Allowance Recorded Average Recorded Investment 5,271 3,000
With an Allowance Recorded Interest Income Recognized 69 [3] 98 [3]
With no Related Allowance Recorded Unpaid Principal Balance 9 [1] 4,176 [1]
With no Related Allowance Recorded Recorded Investment 9 [2] 3,779 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 18 3,885
With no Related Allowance Recorded Interest Income Recognized    [3]    [3]
Real Estate Loans [Member] | 1-4 Family - closed end [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 12,820 [1] 13,522 [1]
With an Allowance Recorded Recorded Investment 12,820 [2] 13,522 [2]
With an Allowance Recorded Related Allowance 1,111 1,324
With an Allowance Recorded Average Recorded Investment 14,000 13,630
With an Allowance Recorded Interest Income Recognized 201 [3] 260 [3]
With no Related Allowance Recorded Unpaid Principal Balance    [1] 4,655 [1]
With no Related Allowance Recorded Recorded Investment    [2] 4,376 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment    4,687
With no Related Allowance Recorded Interest Income Recognized 1 [3] 1 [3]
Real Estate Loans [Member] | Equity Lines [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 406 [1] 528 [1]
With an Allowance Recorded Recorded Investment 406 [2] 528 [2]
With an Allowance Recorded Related Allowance 37 123
With an Allowance Recorded Average Recorded Investment 491 530
With an Allowance Recorded Interest Income Recognized 11 [3] 13 [3]
With no Related Allowance Recorded Unpaid Principal Balance 297 [1] 565 [1]
With no Related Allowance Recorded Recorded Investment 294 [2] 493 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 297 493
With no Related Allowance Recorded Interest Income Recognized    [3]    [3]
Real Estate Loans [Member] | Commercial real estate - owner occupied [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 2,856 [1] 2,047 [1]
With an Allowance Recorded Recorded Investment 2,746 [2] 2,047 [2]
With an Allowance Recorded Related Allowance 1,416 217
With an Allowance Recorded Average Recorded Investment 3,068 2,069
With an Allowance Recorded Interest Income Recognized 42 [3] 135 [3]
With no Related Allowance Recorded Unpaid Principal Balance 1,855 [1] 7,436 [1]
With no Related Allowance Recorded Recorded Investment 826 [2] 5,516 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 1,932 5,568
With no Related Allowance Recorded Interest Income Recognized    [3]    [3]
Real Estate Loans [Member] | Commercial real estate - non-owner occupied [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 3,700 [1] 3,715 [1]
With an Allowance Recorded Recorded Investment 3,700 [2] 3,715 [2]
With an Allowance Recorded Related Allowance 741 701
With an Allowance Recorded Average Recorded Investment 3,771 3,813
With an Allowance Recorded Interest Income Recognized 198 [3] 238 [3]
With no Related Allowance Recorded Unpaid Principal Balance 9,278 [1] 10,077 [1]
With no Related Allowance Recorded Recorded Investment 9,130 [2] 9,780 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment 9,844 9,820
With no Related Allowance Recorded Interest Income Recognized 88 [3] 115 [3]
Real Estate Loans [Member] | Farmland [Member]
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance    [1]    [1]
With an Allowance Recorded Recorded Investment    [2]    [2]
With an Allowance Recorded Related Allowance      
With an Allowance Recorded Average Recorded Investment      
With an Allowance Recorded Interest Income Recognized    [3]    [3]
With no Related Allowance Recorded Unpaid Principal Balance    [1] 282 [1]
With no Related Allowance Recorded Recorded Investment    [2] 282 [2]
With no Related Allowance Recorded Related Allowance      
With no Related Allowance Recorded Average Recorded Investment    290
With no Related Allowance Recorded Interest Income Recognized    [3]    [3]
[1] (1) Contractual principal balance due from customer.
[2] (2) Principal balance on Company's books, less any direct charge offs.
[3] (3) Interest income is recognized on performing balances on a regular accrual basis.