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Allowance for Loan and Lease Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Allowance for loan losses [Roll Forward]      
Beginning balance $ 34,008 $ 33,245 $ 33,245
Provision charged to expense 1,345 1,559 8,568
Losses charged off 2,545 2,188 11,049
Recoveries 807 777 3,244
Ending balance 33,615 33,393 34,008
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 2,135 3,425 2,296
Collectively evaluated for impairment 31,480 29,968 31,712
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 65,286 66,454 65,300
Collectively evaluated for impairment 2,520,222 2,496,860 2,550,054
Commercial Construction [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 3,396 4,033 4,033
Provision charged to expense (296) (212) 189
Losses charged off 0 0 1,135
Recoveries 7 6 309
Ending balance 3,107 3,827 3,396
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 939 1,911 1,189
Collectively evaluated for impairment 2,168 1,916 2,207
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 9,708 11,228 9,810
Collectively evaluated for impairment 101,564 91,075 100,969
Commercial Secured by Real Estate [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 14,535 13,541 13,541
Provision charged to expense (106) 484 2,438
Losses charged off 322 365 1,607
Recoveries 76 22 163
Ending balance 14,183 13,682 14,535
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 1,084 1,192 1,005
Collectively evaluated for impairment 13,099 12,490 13,530
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 39,953 37,923 39,297
Collectively evaluated for impairment 834,484 809,884 833,245
Equipment Lease Financing [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 121 126 126
Provision charged to expense (14) 2 (5)
Losses charged off 0 0 0
Recoveries 0 0 0
Ending balance 107 128 121
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 107 128 121
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 8,122 9,944 8,840
Commercial Other [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 5,238 5,469 5,469
Provision charged to expense (13) (155) 1,477
Losses charged off 633 332 2,265
Recoveries 162 169 557
Ending balance 4,754 5,151 5,238
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 112 322 102
Collectively evaluated for impairment 4,642 4,829 5,136
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 14,604 16,646 15,169
Collectively evaluated for impairment 337,044 358,763 359,712
Real Estate Construction [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 397 376 376
Provision charged to expense 44 (4) 106
Losses charged off 0 0 89
Recoveries 1 0 4
Ending balance 442 372 397
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 442 372 397
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 59,730 51,978 56,075
Real Estate Mortgage [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 4,939 4,767 4,767
Provision charged to expense 356 334 860
Losses charged off 164 131 744
Recoveries 12 10 56
Ending balance 5,143 4,980 4,939
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 5,143 4,980 4,939
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 1,021 657 1,024
Collectively evaluated for impairment 694,493 695,664 696,577
Home Equity [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 601 563 563
Provision charged to expense 51 50 268
Losses charged off 27 47 241
Recoveries 1 5 11
Ending balance 626 571 601
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 626 571 601
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 84,694 79,899 84,880
Consumer Direct [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 1,127 1,102 1,102
Provision charged to expense 753 165 696
Losses charged off 453 314 1,166
Recoveries 146 145 495
Ending balance 1,573 1,098 1,127
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 1,573 1,098 1,127
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 117,497 119,191 122,215
Consumer Indirect [Member]
      
Allowance for loan losses [Roll Forward]      
Beginning balance 3,654 3,268 3,268
Provision charged to expense 570 895 2,539
Losses charged off 946 999 3,802
Recoveries 402 420 1,649
Ending balance 3,680 3,584 3,654
Allowance for Loan Losses Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 3,680 3,584 3,654
Loans Ending balance: [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment $ 282,594 $ 280,462 $ 287,541