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Loans (Schedule of Loans Individually Evaluated for Impairment) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 38,399 $ 39,031 $ 37,647
Unpaid Principal Balance 38,418 39,043 37,659
Related Allowance 1,644 896 1,404
Average Impaired Balance 35,194 38,752 37,895
Interest Income Recognized while impaired 1,502 1,488 1,324
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 254 791 285
Without a related allowance, Unpaid Principal Balance 254 790 285
Without a related allowance, Average Impaired Balance 264 400 247
Without a related allowance, Interest Income Recognized while impaired 10 9 10
With a related allowance, Recorded Investment 259 19 0
With a related allowance, Unpaid Principal Balance 259 19 0
With a related allowance, Related Allowance 259 19 0
With a related allowance, Average Impaired Balance 266 6 0
With a related allowance, Interest Income Recognized while impaired 0 0 0
Owner Occupied [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 7,138 4,914 520
Without a related allowance, Unpaid Principal Balance 7,141 4,914 520
Without a related allowance, Average Impaired Balance 4,869 4,932 534
Without a related allowance, Interest Income Recognized while impaired 185 188 31
With a related allowance, Recorded Investment 2,448 2,499 6,864
With a related allowance, Unpaid Principal Balance 2,448 2,499 6,864
With a related allowance, Related Allowance 127 12 347
With a related allowance, Average Impaired Balance 2,456 2,491 6,879
With a related allowance, Interest Income Recognized while impaired 121 112 269
Non-Owner Occupied [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 9,884 10,394 10,203
Without a related allowance, Unpaid Principal Balance 9,886 10,396 10,205
Without a related allowance, Average Impaired Balance 10,142 10,831 10,675
Without a related allowance, Interest Income Recognized while impaired 511 456 294
With a related allowance, Recorded Investment 1,014 1,321 1,311
With a related allowance, Unpaid Principal Balance 1,018 1,321 1,311
With a related allowance, Related Allowance 501 132 197
With a related allowance, Average Impaired Balance 2 1,332 1,327
With a related allowance, Interest Income Recognized while impaired 0 43 43
Land and Land Improvements [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 5,029 6,181 5,227
Without a related allowance, Unpaid Principal Balance 5,029 6,181 5,227
Without a related allowance, Average Impaired Balance 4,729 6,207 5,270
Without a related allowance, Interest Income Recognized while impaired 87 104 80
With a related allowance, Recorded Investment 1,470 1,140 2,066
With a related allowance, Unpaid Principal Balance 1,470 1,141 2,066
With a related allowance, Related Allowance 525 492 585
With a related allowance, Average Impaired Balance 1,482 1,155 2,074
With a related allowance, Interest Income Recognized while impaired 56 58 80
Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 0 0 0
Without a related allowance, Unpaid Principal Balance 0 0 0
Without a related allowance, Average Impaired Balance 0 0 0
Without a related allowance, Interest Income Recognized while impaired 0 0 0
With a related allowance, Recorded Investment 0 0 0
With a related allowance, Unpaid Principal Balance 0 0 0
With a related allowance, Related Allowance 0 0 0
With a related allowance, Average Impaired Balance 0 0 0
With a related allowance, Interest Income Recognized while impaired 0 0 0
Non-Jumbo [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 4,200 3,852 4,055
Without a related allowance, Unpaid Principal Balance 4,210 3,861 4,065
Without a related allowance, Average Impaired Balance 4,294 3,732 3,910
Without a related allowance, Interest Income Recognized while impaired 209 170 193
With a related allowance, Recorded Investment 1,728 2,617 2,055
With a related allowance, Unpaid Principal Balance 1,729 2,619 2,057
With a related allowance, Related Allowance 217 216 251
With a related allowance, Average Impaired Balance 1,681 2,329 1,851
With a related allowance, Interest Income Recognized while impaired 82 103 78
Jumbo [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 3,581 3,683 3,640
Without a related allowance, Unpaid Principal Balance 3,580 3,682 3,639
Without a related allowance, Average Impaired Balance 3,605 3,711 3,693
Without a related allowance, Interest Income Recognized while impaired 171 176 175
With a related allowance, Recorded Investment 841 859 853
With a related allowance, Unpaid Principal Balance 842 859 853
With a related allowance, Related Allowance 15 25 24
With a related allowance, Average Impaired Balance 847 864 862
With a related allowance, Interest Income Recognized while impaired 42 43 44
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 524 713 524
Without a related allowance, Unpaid Principal Balance 523 713 523
Without a related allowance, Average Impaired Balance 523 710 523
Without a related allowance, Interest Income Recognized while impaired 25 21 22
With a related allowance, Recorded Investment 0 0 0
With a related allowance, Unpaid Principal Balance 0 0 0
With a related allowance, Related Allowance 0 0 0
With a related allowance, Average Impaired Balance 0 0 0
With a related allowance, Interest Income Recognized while impaired 0 0 0
Mortgage Warehouse Lines [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 0 0 0
Without a related allowance, Unpaid Principal Balance 0 0 0
Without a related allowance, Average Impaired Balance 0 0 0
Without a related allowance, Interest Income Recognized while impaired 0 0 0
With a related allowance, Recorded Investment 0 0 0
With a related allowance, Unpaid Principal Balance 0 0 0
With a related allowance, Related Allowance 0 0 0
With a related allowance, Average Impaired Balance 0 0 0
With a related allowance, Interest Income Recognized while impaired 0 0 0
Consumer Portfolio Segment [Member]      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 29 48 44
Without a related allowance, Unpaid Principal Balance 29 48 44
Without a related allowance, Average Impaired Balance 34 52 50
Without a related allowance, Interest Income Recognized while impaired 3 5 5
With a related allowance, Recorded Investment 0 0 0
With a related allowance, Unpaid Principal Balance 0 0 0
With a related allowance, Related Allowance 0 0 0
With a related allowance, Average Impaired Balance 0 0 0
With a related allowance, Interest Income Recognized while impaired 0 0 0
Total Without a Related Allowance      
Financing Receivable, Impaired [Line Items]      
Without a related allowance, Recorded Investment 30,639 30,576 24,498
Without a related allowance, Unpaid Principal Balance 30,652 30,585 24,508
Without a related allowance, Average Impaired Balance 28,460 30,575 24,902
Without a related allowance, Interest Income Recognized while impaired 1,201 1,129 810
Total With a Related Allowance      
Financing Receivable, Impaired [Line Items]      
With a related allowance, Recorded Investment 7,760 8,455 13,149
With a related allowance, Unpaid Principal Balance 7,766 8,458 13,151
With a related allowance, Related Allowance 1,644 896 1,404
With a related allowance, Average Impaired Balance 6,734 8,177 12,993
With a related allowance, Interest Income Recognized while impaired 301 359 514
Total Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 27,496 27,259 26,476
Unpaid Principal Balance 27,505 27,261 26,478
Related Allowance 1,412 655 1,129
Average Impaired Balance 24,210 27,354 27,006
Interest Income Recognized while impaired 970 970 807
Total Residential Real Estate      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 10,874 11,724 11,127
Unpaid Principal Balance 10,884 11,734 11,137
Related Allowance 232 241 275
Average Impaired Balance 10,950 11,346 10,839
Interest Income Recognized while impaired 529 513 512
Total Consumer      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 29 48 44
Unpaid Principal Balance 29 48 44
Related Allowance 0 0 0
Average Impaired Balance 34 52 50
Interest Income Recognized while impaired $ 3 $ 5 $ 5