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Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for loan losses [Roll Forward]      
Beginning balance $ 34,447 $ 34,008 $ 33,245
Provision charged to expense 8,650 8,755 8,568
Losses charged off 9,870 11,436 11,049
Recoveries 2,867 3,120 3,244
Ending balance 36,094 34,447 34,008
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 2,461 1,742 2,296
Collectively evaluated for impairment 33,633 32,705 31,712
Loans ending balance [Abstract]      
Individually evaluated for impairment 49,888 59,068 65,300
Collectively evaluated for impairment 2,824,073 2,674,756 2,550,054
Commercial [Member] | Construction [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 2,896 3,396 4,033
Provision charged to expense (707) (513) 189
Losses charged off 3 15 1,135
Recoveries 13 28 309
Ending balance 2,199 2,896 3,396
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 831 734 1,189
Collectively evaluated for impairment 1,368 2,162 2,207
Loans ending balance [Abstract]      
Individually evaluated for impairment 6,263 9,627 9,810
Collectively evaluated for impairment 71,757 112,315 100,969
Commercial [Member] | Real Estate [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 13,618 14,535 13,541
Provision charged to expense 2,135 941 2,438
Losses charged off 1,379 2,163 1,607
Recoveries 60 305 163
Ending balance 14,434 13,618 14,535
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 1,227 827 1,005
Collectively evaluated for impairment 13,207 12,791 13,530
Loans ending balance [Abstract]      
Individually evaluated for impairment 33,421 34,357 39,297
Collectively evaluated for impairment 1,019,498 914,269 833,245
Commercial [Member] | Equipment Lease Financing [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 119 121 126
Provision charged to expense (40) (2) (5)
Losses charged off 0 0 0
Recoveries 0 0 0
Ending balance 79 119 121
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 79 119 121
Loans ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 8,514 10,344 8,840
Commercial [Member] | Other [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 4,263 5,238 5,469
Provision charged to expense 1,338 1,545 1,477
Losses charged off 1,961 3,141 2,265
Recoveries 585 621 557
Ending balance 4,225 4,263 5,238
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 403 181 102
Collectively evaluated for impairment 3,822 4,082 5,136
Loans ending balance [Abstract]      
Individually evaluated for impairment 8,460 13,807 15,169
Collectively evaluated for impairment 350,438 338,241 359,712
Residential [Member] | Construction [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 534 397 376
Provision charged to expense 147 258 106
Losses charged off 135 123 89
Recoveries 4 2 4
Ending balance 550 534 397
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 550 534 397
Loans ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 61,750 62,412 56,075
Residential [Member] | Real Estate [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 6,094 4,939 4,767
Provision charged to expense 1,888 2,173 860
Losses charged off 1,421 1,058 744
Recoveries 117 40 56
Ending balance 6,678 6,094 4,939
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 6,678 6,094 4,939
Loans ending balance [Abstract]      
Individually evaluated for impairment 1,744 1,277 1,024
Collectively evaluated for impairment 706,130 711,188 696,577
Residential [Member] | Home Equity [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 756 601 563
Provision charged to expense 158 265 268
Losses charged off 129 115 241
Recoveries 54 5 11
Ending balance 839 756 601
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 839 756 601
Loans ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 89,450 88,335 84,880
Consumer [Member] | Consumer Direct [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 1,574 1,127 1,102
Provision charged to expense 891 1,207 696
Losses charged off 1,306 1,326 1,166
Recoveries 435 566 495
Ending balance 1,594 1,574 1,127
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 1,594 1,574 1,127
Loans ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 126,406 122,136 122,215
Consumer [Member] | Consumer Indirect [Member]      
Allowance for loan losses [Roll Forward]      
Beginning balance 4,593 3,654 3,268
Provision charged to expense 2,840 2,881 2,539
Losses charged off 3,536 3,495 3,802
Recoveries 1,599 1,553 1,649
Ending balance 5,496 4,593 3,654
Allowance for loan losses ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 5,496 4,593 3,654
Loans ending balance [Abstract]      
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment $ 390,130 $ 315,516 $ 287,541