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Loan Portfolio and Credit Quality Impaired Loans With and Without Related Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] $ 24,404 $ 29,031 $ 24,404 $ 29,031 $ 23,260
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 14,078 20,735 14,078 20,735 15,912
Impaired Financing Receivable, Recorded Investment [1] 38,482 49,766 38,482 49,766 39,172
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 32,402 39,708 32,402 39,708 33,390
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 14,507 22,720 14,507 22,720 17,112
Impaired Financing Receivable, Unpaid Principal Balance 46,909 62,428 46,909 62,428 50,502
Impaired Financing Receivable, Related Allowance 1,316 2,657 1,316 2,657 1,629
Impaired Financing Receivable, Related Allowance 1,316 2,657 1,316 2,657 1,629
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 25,807 30,967 24,674 34,510 32,521
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 13,208 19,367 13,946 19,324 18,546
Impaired Financing Receivable, Average Recorded Investment 39,015 50,334 38,620 53,834 51,067
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 537 453 1,264 2,472 2,754
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 115 137 353 507 637
Impaired Financing Receivable, Interest Income, Cash Basis Method 652 590 1,617 2,979 3,391
Commercial and industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 11,742 2,076 11,742 2,076 2,259
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 37 19 37 19 15
Impaired Financing Receivable, Recorded Investment [1] 11,779 2,095 11,779 2,095 2,274
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 13,874 2,369 13,874 2,369 2,569
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 37 19 37 19 15
Impaired Financing Receivable, Unpaid Principal Balance 13,911 2,388 13,911 2,388 2,584
Impaired Financing Receivable, Related Allowance 22 0 22 0 270
Impaired Financing Receivable, Related Allowance 22 0 22 0 270
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 10,774 1,954 6,325 1,441 1,638
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 37 441 33 848 657
Impaired Financing Receivable, Average Recorded Investment 10,811 2,395 6,358 2,289 2,295
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 98 14 169 822 836
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 12 1 66 66
Impaired Financing Receivable, Interest Income, Cash Basis Method 98 26 170 888 902
Commercial real estate [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 5,966 15,744 5,966 15,744 12,116
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 7,164 12,262 7,164 12,262 7,346
Impaired Financing Receivable, Recorded Investment [1] 13,130 28,006 13,130 28,006 19,462
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 11,148 23,696 11,148 23,696 20,113
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 7,593 14,091 7,593 14,091 7,775
Impaired Financing Receivable, Unpaid Principal Balance 18,741 37,787 18,741 37,787 27,888
Impaired Financing Receivable, Related Allowance 593 1,300 593 1,300 713
Impaired Financing Receivable, Related Allowance 593 1,300 593 1,300 713
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 7,288 17,698 9,672 19,140 17,885
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 7,194 9,818 7,259 9,166 8,749
Impaired Financing Receivable, Average Recorded Investment 14,482 27,516 16,931 28,306 26,634
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 332 320 874 1,286 1,494
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 79 82 237 298 385
Impaired Financing Receivable, Interest Income, Cash Basis Method 411 402 1,111 1,584 1,879
Construction and land [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 224 1,148 224 1,148 1,097
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 2,200 0 2,200 2,200
Impaired Financing Receivable, Recorded Investment [1] 224 3,348 224 3,348 3,297
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 548 2,177 548 2,177 2,132
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 2,356 0 2,356 2,356
Impaired Financing Receivable, Unpaid Principal Balance 548 4,533 548 4,533 4,488
Impaired Financing Receivable, Related Allowance 0 172 0 172 172
Impaired Financing Receivable, Related Allowance 0 172 0 172 172
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 400 1,187 1,332 3,599 3,027
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 2,200 660 2,200 2,200
Impaired Financing Receivable, Average Recorded Investment 400 3,387 1,992 5,799 5,227
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 48 0 48 92 92
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 0 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method 48 0 48 92 92
Residential [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 6,472 10,006 6,472 10,006 7,788
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 6,877 6,254 6,877 6,254 6,351
Impaired Financing Receivable, Recorded Investment [1] 13,349 16,260 13,349 16,260 14,139
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 6,832 11,409 6,832 11,409 8,576
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 6,877 6,254 6,877 6,254 6,966
Impaired Financing Receivable, Unpaid Principal Balance 13,709 17,663 13,709 17,663 15,542
Impaired Financing Receivable, Related Allowance 701 1,185 701 1,185 474
Impaired Financing Receivable, Related Allowance 701 1,185 701 1,185 474
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 7,345 9,821 7,345 9,573 9,384
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 5,977 6,908 5,994 7,110 6,940
Impaired Financing Receivable, Average Recorded Investment 13,322 16,729 13,339 16,683 16,324
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 59 58 173 209 269
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 36 43 115 143 186
Impaired Financing Receivable, Interest Income, Cash Basis Method 95 101 288 352 455
Home equity [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 0 50 0 50 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0 0 0 0
Impaired Financing Receivable, Recorded Investment [1] 0 50 0 50 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 50 0 50 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance 0 50 0 50 0
Impaired Financing Receivable, Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 50 0 50 42
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment 0 50 0 50 42
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 0 1 0 2 2
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 0 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 1 0 2 2
Consumer and other [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 0 7 0 7 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0 0 0 0
Impaired Financing Receivable, Recorded Investment [1] 0 7 0 7 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 7 0 7 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance 0 7 0 7 0
Impaired Financing Receivable, Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 257 0 707 545
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment 0 257 0 707 545
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 0 60 0 61 61
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 0 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method $ 0 $ 60 $ 0 $ 61 $ 61
[1] Recorded investment represents the client loan balance net of historical charge-offs and historical nonaccrual interest paid, which was applied to principal.