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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Impaired Loans and Leases) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Recorded investment      
With no impairment reserve recorded $ 16,975 $ 11,345 $ 15,175
With impairment reserve recorded 9,746 14,566 8,858
Total 26,721 25,911 24,033
Unpaid principal balance      
With no impairment reserve recorded 21,671 14,722 19,026
With impairment reserve recorded 11,694 14,572 8,863
Total 33,365 29,294 27,889
Impairment reserve      
Impairment reserve 4,491 5,599 1,113
Average recorded investment      
With no impairment reserve recorded 18,624 13,371 9,721
With impairment reserve recorded 14,540 9,615 1,722
Total 33,164 22,986 11,443
Foregone interest income      
With no impairment reserve recorded 1,898 838 597
With impairment reserve recorded 797 779 153
Total 2,695 1,617 750
Interest income recognized      
With no impairment reserve recorded 454 614 85
With impairment reserve recorded 0 0 2
Total 454 614 87
Net foregone interest income      
With no impairment reserve recorded 1,444 224 512
With impairment reserve recorded 797 779 151
Total 2,241 1,003 663
Commercial real estate — owner occupied      
Recorded investment      
With no impairment reserve recorded 7,077 1,788 2,164
With impairment reserve recorded 0 499 814
Total 7,077 2,287 2,978
Unpaid principal balance      
With no impairment reserve recorded 7,077 1,788 2,164
With impairment reserve recorded 0 499 814
Total 7,077 2,287 2,978
Impairment reserve      
Impairment reserve 0 70 20
Average recorded investment      
With no impairment reserve recorded 5,549 3,577 712
With impairment reserve recorded 0 111 215
Total 5,549 3,688 927
Foregone interest income      
With no impairment reserve recorded 613 328 53
With impairment reserve recorded 0 28 7
Total 613 356 60
Interest income recognized      
With no impairment reserve recorded 0 118 12
With impairment reserve recorded 0 0 2
Total 0 118 14
Net foregone interest income      
With no impairment reserve recorded 613 210 41
With impairment reserve recorded 0 28 5
Total 613 238 46
Commercial real estate — non-owner occupied      
Recorded investment      
With no impairment reserve recorded 34 1,609 2,314
With impairment reserve recorded 0 0 0
Total 34 1,609 2,314
Unpaid principal balance      
With no impairment reserve recorded 75 1,647 2,355
With impairment reserve recorded 0 0 0
Total 75 1,647 2,355
Impairment reserve      
Impairment reserve 0 0 0
Average recorded investment      
With no impairment reserve recorded 1,830 1,318 962
With impairment reserve recorded 0 0 0
Total 1,830 1,318 962
Foregone interest income      
With no impairment reserve recorded 97 91 25
With impairment reserve recorded 0 0 0
Total 97 91 25
Interest income recognized      
With no impairment reserve recorded 226 79 0
With impairment reserve recorded 0 0 0
Total 226 79 0
Net foregone interest income      
With no impairment reserve recorded (129) 12 25
With impairment reserve recorded 0 0 0
Total (129) 12 25
Land development      
Recorded investment      
With no impairment reserve recorded 2,627 3,440 4,413
With impairment reserve recorded 0 0 0
Total 2,627 3,440 4,413
Unpaid principal balance      
With no impairment reserve recorded 5,297 6,111 7,083
With impairment reserve recorded 0 0 0
Total 5,297 6,111 7,083
Impairment reserve      
Impairment reserve 0 0 0
Average recorded investment      
With no impairment reserve recorded 3,092 3,898 4,333
With impairment reserve recorded 0 0 0
Total 3,092 3,898 4,333
Foregone interest income      
With no impairment reserve recorded 84 107 133
With impairment reserve recorded 0 0 0
Total 84 107 133
Interest income recognized      
With no impairment reserve recorded 0 0 0
With impairment reserve recorded 0 0 0
Total 0 0 0
Net foregone interest income      
With no impairment reserve recorded 84 107 133
With impairment reserve recorded 0 0 0
Total 84 107 133
Construction      
Recorded investment      
With no impairment reserve recorded 0 436 120
With impairment reserve recorded 2,872 2,482 397
Total 2,872 2,918 517
Unpaid principal balance      
With no impairment reserve recorded 0 438 120
With impairment reserve recorded 2,872 2,482 397
Total 2,872 2,920 517
Impairment reserve      
Impairment reserve 415 1,790 48
Average recorded investment      
With no impairment reserve recorded 2,000 291 474
With impairment reserve recorded 2,252 834 34
Total 4,252 1,125 508
Foregone interest income      
With no impairment reserve recorded 134 20 0
With impairment reserve recorded 158 45 0
Total 292 65 0
Interest income recognized      
With no impairment reserve recorded 214 0 0
With impairment reserve recorded 0 0 0
Total 214 0 0
Net foregone interest income      
With no impairment reserve recorded (80) 20 0
With impairment reserve recorded 158 45 0
Total 78 65 0
Multi-family      
Recorded investment      
With no impairment reserve recorded 0 0 2
With impairment reserve recorded 0 0 0
Total 0 0 2
Unpaid principal balance      
With no impairment reserve recorded 0 0 369
With impairment reserve recorded 0 0 0
Total 0 0 369
Impairment reserve      
Impairment reserve 0 0 0
Average recorded investment      
With no impairment reserve recorded 1 0 10
With impairment reserve recorded 0 0 0
Total 1 0 10
Foregone interest income      
With no impairment reserve recorded 0 1 27
With impairment reserve recorded 0 0 0
Total 0 1 27
Interest income recognized      
With no impairment reserve recorded 0 134 0
With impairment reserve recorded 0 0 0
Total 0 134 0
Net foregone interest income      
With no impairment reserve recorded 0 (133) 27
With impairment reserve recorded 0 0 0
Total 0 (133) 27
1-4 family      
Recorded investment      
With no impairment reserve recorded 1,423 2,379 2,423
With impairment reserve recorded 0 193 945
Total 1,423 2,572 3,368
Unpaid principal balance      
With no impairment reserve recorded 1,706 2,379 2,486
With impairment reserve recorded 0 199 950
Total 1,706 2,578 3,436
Impairment reserve      
Impairment reserve 0 39 173
Average recorded investment      
With no impairment reserve recorded 2,146 2,755 1,604
With impairment reserve recorded 0 203 605
Total 2,146 2,958 2,209
Foregone interest income      
With no impairment reserve recorded 53 125 82
With impairment reserve recorded 0 5 34
Total 53 130 116
Interest income recognized      
With no impairment reserve recorded 7 94 4
With impairment reserve recorded 0 0 0
Total 7 94 4
Net foregone interest income      
With no impairment reserve recorded 46 31 78
With impairment reserve recorded 0 5 34
Total 46 36 112
Commercial and industrial      
Recorded investment      
With no impairment reserve recorded 5,465 1,307 2,546
With impairment reserve recorded 6,865 11,166 6,603
Total 12,330 12,473 9,149
Unpaid principal balance      
With no impairment reserve recorded 6,502 1,307 2,590
With impairment reserve recorded 8,813 11,166 6,603
Total 15,315 12,473 9,193
Impairment reserve      
Impairment reserve 4,067 3,700 847
Average recorded investment      
With no impairment reserve recorded 3,634 709 544
With impairment reserve recorded 12,288 8,448 810
Total 15,922 9,157 1,354
Foregone interest income      
With no impairment reserve recorded 858 79 172
With impairment reserve recorded 639 701 102
Total 1,497 780 274
Interest income recognized      
With no impairment reserve recorded 7 62 6
With impairment reserve recorded 0 0 0
Total 7 62 6
Net foregone interest income      
With no impairment reserve recorded 851 17 166
With impairment reserve recorded 639 701 102
Total 1,490 718 268
Direct financing leases, net      
Recorded investment      
With no impairment reserve recorded 0 0 38
With impairment reserve recorded 0 0 0
Total 0 0 38
Unpaid principal balance      
With no impairment reserve recorded 0 0 38
With impairment reserve recorded 0 0 0
Total 0 0 38
Impairment reserve      
Impairment reserve 0 0 0
Average recorded investment      
With no impairment reserve recorded 0 6 4
With impairment reserve recorded 0 0 0
Total 0 6 4
Foregone interest income      
With no impairment reserve recorded 0 0 0
With impairment reserve recorded 0 0 0
Total 0 0 0
Interest income recognized      
With no impairment reserve recorded 0 0 0
With impairment reserve recorded 0 0 0
Total 0 0 0
Net foregone interest income      
With no impairment reserve recorded 0 0 0
With impairment reserve recorded 0 0 0
Total 0 0 0
Home equity and second mortgages      
Recorded investment      
With no impairment reserve recorded 4 8 500
With impairment reserve recorded 0 0 99
Total 4 8 599
Unpaid principal balance      
With no impairment reserve recorded 3 8 500
With impairment reserve recorded 0 0 99
Total 3 8 599
Impairment reserve      
Impairment reserve 0 0 25
Average recorded investment      
With no impairment reserve recorded 7 307 390
With impairment reserve recorded 0 0 58
Total 7 307 448
Foregone interest income      
With no impairment reserve recorded 0 16 23
With impairment reserve recorded 0 0 10
Total 0 16 33
Interest income recognized      
With no impairment reserve recorded 0 127 63
With impairment reserve recorded 0 0 0
Total 0 127 63
Net foregone interest income      
With no impairment reserve recorded 0 (111) (40)
With impairment reserve recorded 0 0 10
Total 0 (111) (30)
Other      
Recorded investment      
With no impairment reserve recorded 345 378 655
With impairment reserve recorded 9 226 0
Total 354 604 655
Unpaid principal balance      
With no impairment reserve recorded 1,011 1,044 1,321
With impairment reserve recorded 9 226 0
Total 1,020 1,270 1,321
Impairment reserve      
Impairment reserve 9 0 0
Average recorded investment      
With no impairment reserve recorded 365 510 688
With impairment reserve recorded 0 19 0
Total 365 529 688
Foregone interest income      
With no impairment reserve recorded 59 71 82
With impairment reserve recorded 0 0 0
Total 59 71 82
Interest income recognized      
With no impairment reserve recorded 0 0 0
With impairment reserve recorded 0 0 0
Total 0 0 0
Net foregone interest income      
With no impairment reserve recorded 59 71 82
With impairment reserve recorded 0 0 0
Total $ 59 $ 71 $ 82