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Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Allowance for loan losses [Roll Forward]          
Beginning balance $ 35,190 $ 33,617 $ 34,447 $ 34,008 $ 34,008
Provision charged to expense 2,520 3,300 6,740 5,380 8,755
Losses charged off 2,899 3,470 7,819 7,644 11,436
Recoveries 729 643 2,172 2,346 3,120
Ending balance 35,540 34,090 35,540 34,090 34,447
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 1,348 2,218 1,348 2,218 1,742
Collectively evaluated for impairment 34,192 31,872 34,192 31,872 32,705
Loans Ending balance [Abstract]          
Individually evaluated for impairment 48,339 66,911 48,339 66,911 59,068
Collectively evaluated for impairment 2,772,121 2,616,994 2,772,121 2,616,994 2,674,756
Commercial [Member] | Construction [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 2,622 2,916 2,896 3,396 3,396
Provision charged to expense 151 84 (127) (406) (513)
Losses charged off 0 0 2 0 15
Recoveries 3 15 9 25 28
Ending balance 2,776 3,015 2,776 3,015 2,896
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 719 734 719 734 734
Collectively evaluated for impairment 2,057 2,281 2,057 2,281 2,162
Loans Ending balance [Abstract]          
Individually evaluated for impairment 8,080 9,399 8,080 9,399 9,627
Collectively evaluated for impairment 98,775 110,849 98,775 110,849 112,315
Commercial [Member] | Real Estate [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 13,022 14,402 13,618 14,535 14,535
Provision charged to expense 293 1,255 577 1,489 941
Losses charged off 364 834 1,290 1,452 2,163
Recoveries 2 12 48 263 305
Ending balance 12,953 14,835 12,953 14,835 13,618
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 317 1,273 317 1,273 827
Collectively evaluated for impairment 12,636 13,562 12,636 13,562 12,791
Loans Ending balance [Abstract]          
Individually evaluated for impairment 31,153 39,080 31,153 39,080 34,357
Collectively evaluated for impairment 966,501 892,375 966,501 892,375 914,269
Commercial [Member] | Equipment Lease Financing [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 113 102 119 121 121
Provision charged to expense (9) 25 (15) 6 (2)
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Ending balance 104 127 104 127 119
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 104 127 104 127 119
Loans Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 9,146 10,055 9,146 10,055 10,344
Commercial [Member] | Other [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 4,414 4,677 4,263 5,238 5,238
Provision charged to expense 153 959 1,054 1,059 1,545
Losses charged off 431 1,169 1,495 2,074 3,141
Recoveries 149 154 463 398 621
Ending balance 4,285 4,621 4,285 4,621 4,263
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 312 211 312 211 181
Collectively evaluated for impairment 3,973 4,410 3,973 4,410 4,082
Loans Ending balance [Abstract]          
Individually evaluated for impairment 7,917 16,558 7,917 16,558 13,807
Collectively evaluated for impairment 338,401 330,477 338,401 330,477 338,241
Residential [Member] | Construction [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 570 450 534 397 397
Provision charged to expense 61 (6) 184 161 258
Losses charged off 20 7 110 123 123
Recoveries 0 0 3 2 2
Ending balance 611 437 611 437 534
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 611 437 611 437 534
Loans Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 62,226 62,105 62,226 62,105 62,412
Residential [Member] | Real Estate [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 6,965 5,142 6,094 4,939 4,939
Provision charged to expense 564 8 2,023 412 2,173
Losses charged off 647 216 1,260 437 1,058
Recoveries 52 10 77 30 40
Ending balance 6,934 4,944 6,934 4,944 6,094
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 6,934 4,944 6,934 4,944 6,094
Loans Ending balance [Abstract]          
Individually evaluated for impairment 1,189 1,874 1,189 1,874 1,277
Collectively evaluated for impairment 704,998 701,449 704,998 701,449 711,188
Residential [Member] | Home Equity [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 867 643 756 601 601
Provision charged to expense (38) 42 128 110 265
Losses charged off 0 65 67 93 115
Recoveries 41 1 53 3 5
Ending balance 870 621 870 621 756
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 870 621 870 621 756
Loans Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 88,624 88,291 88,624 88,291 88,335
Consumer [Member] | Consumer Direct [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 1,541 1,597 1,574 1,127 1,127
Provision charged to expense 382 216 804 1,031 1,207
Losses charged off 436 298 1,101 980 1,326
Recoveries 113 96 323 433 566
Ending balance 1,600 1,611 1,600 1,611 1,574
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 1,600 1,611 1,600 1,611 1,574
Loans Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 125,847 121,367 125,847 121,367 122,136
Consumer [Member] | Consumer Indirect [Member]          
Allowance for loan losses [Roll Forward]          
Beginning balance 5,076 3,688 4,593 3,654 3,654
Provision charged to expense 963 717 2,112 1,518 2,881
Losses charged off 1,001 881 2,494 2,485 3,495
Recoveries 369 355 1,196 1,192 1,553
Ending balance 5,407 3,879 5,407 3,879 4,593
Allowance for Loan Losses Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 5,407 3,879 5,407 3,879 4,593
Loans Ending balance [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment $ 377,603 $ 300,026 $ 377,603 $ 300,026 $ 315,516