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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
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Recorded Investment(1)    
With no impairment reserve recorded $ 16,971 $ 16,975
With impairment reserve recorded 13,829 9,746
Total 30,800 26,721
Unpaid Principal Balance    
With no impairment reserve recorded 26,028 21,671
With impairment reserve recorded 15,164 11,694
Total 41,192 33,365
Impairment Reserve    
Impairment Reserve 4,569 4,491
Average Recorded Investment(2)    
With no impairment reserve recorded 16,152 18,624
With impairment reserve recorded 10,319 14,540
Total 26,471 33,164
Foregone Interest Income    
With no impairment reserve recorded 1,600 1,898
With impairment reserve recorded 944 797
Foregone interest income 2,544 2,695
Interest Income Recognized    
With no impairment reserve recorded 760 454
With impairment reserve recorded 0 0
Total 760 454
Net Foregone Interest Income    
With no impairment reserve recorded 840 1,444
With impairment reserve recorded 944 797
Total 1,784 2,241
Commercial real estate — owner occupied    
Recorded Investment(1)    
With no impairment reserve recorded 9,326 7,077
With impairment reserve recorded 1,144 0
Total 10,470 7,077
Unpaid Principal Balance    
With no impairment reserve recorded 12,451 7,077
With impairment reserve recorded 1,144 0
Total 13,595 7,077
Impairment Reserve    
Impairment Reserve 193 0
Average Recorded Investment(2)    
With no impairment reserve recorded 7,305 5,549
With impairment reserve recorded 255 0
Total 7,560 5,549
Foregone Interest Income    
With no impairment reserve recorded 614 613
With impairment reserve recorded 64 0
Foregone interest income 678 613
Interest Income Recognized    
With no impairment reserve recorded 197 0
With impairment reserve recorded 0 0
Total 197 0
Net Foregone Interest Income    
With no impairment reserve recorded 417 613
With impairment reserve recorded 64 0
Total 481 613
Commercial real estate — non-owner occupied    
Recorded Investment(1)    
With no impairment reserve recorded 32 34
With impairment reserve recorded 0 0
Total 32 34
Unpaid Principal Balance    
With no impairment reserve recorded 72 75
With impairment reserve recorded 0 0
Total 72 75
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(2)    
With no impairment reserve recorded 34 1,830
With impairment reserve recorded 0 0
Total 34 1,830
Foregone Interest Income    
With no impairment reserve recorded 1 97
With impairment reserve recorded 0 0
Foregone interest income 1 97
Interest Income Recognized    
With no impairment reserve recorded 0 226
With impairment reserve recorded 0 0
Total 0 226
Net Foregone Interest Income    
With no impairment reserve recorded 1 (129)
With impairment reserve recorded 0 0
Total 1 (129)
Land development    
Recorded Investment(1)    
With no impairment reserve recorded 2,136 2,627
With impairment reserve recorded 121 0
Total 2,257 2,627
Unpaid Principal Balance    
With no impairment reserve recorded 6,432 5,297
With impairment reserve recorded 121 0
Total 6,553 5,297
Impairment Reserve    
Impairment Reserve 35 0
Average Recorded Investment(2)    
With no impairment reserve recorded 2,373 3,092
With impairment reserve recorded 39 0
Total 2,412 3,092
Foregone Interest Income    
With no impairment reserve recorded 33 84
With impairment reserve recorded 2 0
Foregone interest income 35 84
Interest Income Recognized    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Net Foregone Interest Income    
With no impairment reserve recorded 33 84
With impairment reserve recorded 2 0
Total 35 84
Construction    
Recorded Investment(1)    
With no impairment reserve recorded 0 0
With impairment reserve recorded 1,879 2,872
Total 1,879 2,872
Unpaid Principal Balance    
With no impairment reserve recorded 0 0
With impairment reserve recorded 2,872 2,872
Total 2,872 2,872
Impairment Reserve    
Impairment Reserve 379 415
Average Recorded Investment(2)    
With no impairment reserve recorded 2,039 2,000
With impairment reserve recorded 207 2,252
Total 2,246 4,252
Foregone Interest Income    
With no impairment reserve recorded 0 134
With impairment reserve recorded 162 158
Foregone interest income 162 292
Interest Income Recognized    
With no impairment reserve recorded 0 214
With impairment reserve recorded 0 0
Total 0 214
Net Foregone Interest Income    
With no impairment reserve recorded 0 (80)
With impairment reserve recorded 162 158
Total 162 78
Multi-family    
Recorded Investment(1)    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Unpaid Principal Balance    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(2)    
With no impairment reserve recorded 0 1
With impairment reserve recorded 0 0
Total 0 1
Foregone Interest Income    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Foregone interest income 0 0
Interest Income Recognized    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Net Foregone Interest Income    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
1-4 family    
Recorded Investment(1)    
With no impairment reserve recorded 752 1,423
With impairment reserve recorded 0 0
Total 752 1,423
Unpaid Principal Balance    
With no impairment reserve recorded 1,022 1,706
With impairment reserve recorded 0 0
Total 1,022 1,706
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(2)    
With no impairment reserve recorded 961 2,146
With impairment reserve recorded 0 0
Total 961 2,146
Foregone Interest Income    
With no impairment reserve recorded 40 53
With impairment reserve recorded 0 0
Foregone interest income 40 53
Interest Income Recognized    
With no impairment reserve recorded 76 7
With impairment reserve recorded 0 0
Total 76 7
Net Foregone Interest Income    
With no impairment reserve recorded (36) 46
With impairment reserve recorded 0 0
Total (36) 46
Commercial and industrial    
Recorded Investment(1)    
With no impairment reserve recorded 4,434 5,465
With impairment reserve recorded 10,525 6,865
Total 14,959 12,330
Unpaid Principal Balance    
With no impairment reserve recorded 5,094 6,502
With impairment reserve recorded 10,867 8,813
Total 15,961 15,315
Impairment Reserve    
Impairment Reserve 3,802 4,067
Average Recorded Investment(2)    
With no impairment reserve recorded 3,133 3,634
With impairment reserve recorded 9,810 12,288
Total 12,943 15,922
Foregone Interest Income    
With no impairment reserve recorded 870 858
With impairment reserve recorded 716 639
Foregone interest income 1,586 1,497
Interest Income Recognized    
With no impairment reserve recorded 442 7
With impairment reserve recorded 0 0
Total 442 7
Net Foregone Interest Income    
With no impairment reserve recorded 428 851
With impairment reserve recorded 716 639
Total 1,144 1,490
Direct financing leases, net    
Recorded Investment(1)    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Unpaid Principal Balance    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(2)    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Foregone Interest Income    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Foregone interest income 0 0
Interest Income Recognized    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Net Foregone Interest Income    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Home equity and second mortgages    
Recorded Investment(1)    
With no impairment reserve recorded 0 4
With impairment reserve recorded 0 0
Total 0 4
Unpaid Principal Balance    
With no impairment reserve recorded 0 3
With impairment reserve recorded 0 0
Total 0 3
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(2)    
With no impairment reserve recorded 1 7
With impairment reserve recorded 0 0
Total 1 7
Foregone Interest Income    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Foregone interest income 0 0
Interest Income Recognized    
With no impairment reserve recorded 45 0
With impairment reserve recorded 0 0
Total 45 0
Net Foregone Interest Income    
With no impairment reserve recorded (45) 0
With impairment reserve recorded 0 0
Total (45) 0
Other    
Recorded Investment(1)    
With no impairment reserve recorded 291 345
With impairment reserve recorded 160 9
Total 451 354
Unpaid Principal Balance    
With no impairment reserve recorded 957 1,011
With impairment reserve recorded 160 9
Total 1,117 1,020
Impairment Reserve    
Impairment Reserve 160 9
Average Recorded Investment(2)    
With no impairment reserve recorded 306 365
With impairment reserve recorded 8 0
Total 314 365
Foregone Interest Income    
With no impairment reserve recorded 42 59
With impairment reserve recorded 0 0
Foregone interest income 42 59
Interest Income Recognized    
With no impairment reserve recorded 0 0
With impairment reserve recorded 0 0
Total 0 0
Net Foregone Interest Income    
With no impairment reserve recorded 42 59
With impairment reserve recorded 0 0
Total $ 42 $ 59