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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
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Recorded Investment      
With no impairment reserve recorded $ 18,866   $ 16,975
With impairment reserve recorded 12,474   9,746
Total 31,340   26,721
Unpaid Principal Balance      
With no impairment reserve recorded 28,039   21,671
With impairment reserve recorded 14,784   11,694
Total 42,823   33,365
Impairment Reserve      
Impairment Reserve 4,707   4,491
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 15,671 $ 18,624  
With impairment reserve recorded [1] 8,707 14,540  
Total [1] 24,378 33,164  
Foregone Interest Income      
With no impairment reserve recorded 657 1,898  
With impairment reserve recorded 831 797  
Foregone interest income 1,488 2,695  
Interest Income Recognized      
With no impairment reserve recorded 414 454  
With impairment reserve recorded 0 0  
Total 414 454  
Net Foregone Interest Income      
With no impairment reserve recorded 243 1,444  
With impairment reserve recorded 831 797  
Total 1,074 2,241  
Commercial real estate — owner occupied      
Recorded Investment      
With no impairment reserve recorded 10,046   7,077
With impairment reserve recorded 0   0
Total 10,046   7,077
Unpaid Principal Balance      
With no impairment reserve recorded 11,345   7,077
With impairment reserve recorded 0   0
Total 11,345   7,077
Impairment Reserve      
Impairment Reserve 0   0
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 6,311 5,549  
With impairment reserve recorded [1] 0 0  
Total [1] 6,311 5,549  
Foregone Interest Income      
With no impairment reserve recorded 270 613  
With impairment reserve recorded 0 0  
Foregone interest income 270 613  
Interest Income Recognized      
With no impairment reserve recorded 162 0  
With impairment reserve recorded 0 0  
Total 162 0  
Net Foregone Interest Income      
With no impairment reserve recorded 108 613  
With impairment reserve recorded 0 0  
Total 108 613  
Commercial real estate — non-owner occupied      
Recorded Investment      
With no impairment reserve recorded 31   34
With impairment reserve recorded 0   0
Total 31   34
Unpaid Principal Balance      
With no impairment reserve recorded 71   75
With impairment reserve recorded 0   0
Total 71   75
Impairment Reserve      
Impairment Reserve 0   0
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 35 1,830  
With impairment reserve recorded [1] 0 0  
Total [1] 35 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      
With no impairment reserve recorded 2,311   2,627
With impairment reserve recorded 0   0
Total 2,311   2,627
Unpaid Principal Balance      
With no impairment reserve recorded 6,608   5,297
With impairment reserve recorded 0   0
Total 6,608   5,297
Impairment Reserve      
Impairment Reserve 0   0
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 2,481 3,092  
With impairment reserve recorded [1] 0 0  
Total [1] 2,481 3,092  
Foregone Interest Income      
With no impairment reserve recorded 34 84  
With impairment reserve recorded 0 0  
Foregone interest income 34 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 34 84  
With impairment reserve recorded 0 0  
Total 34 84  
Construction      
Recorded Investment      
With no impairment reserve recorded 1,879   0
With impairment reserve recorded 0   2,872
Total 1,879   2,872
Unpaid Principal Balance      
With no impairment reserve recorded 2,872   0
With impairment reserve recorded 0   2,872
Total 2,872   2,872
Impairment Reserve      
Impairment Reserve 0   415
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 2,432 2,000  
With impairment reserve recorded [1] 0 2,252  
Total [1] 2,432 4,252  
Foregone Interest Income      
With no impairment reserve recorded 106 134  
With impairment reserve recorded 0 158  
Foregone interest income 106 292  
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 106 (80)  
With impairment reserve recorded 0 158  
Total 106 78  
Multi-family      
Recorded Investment      
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(1)      
With no impairment reserve recorded [1] 0 1  
With impairment reserve recorded [1] 0 0  
Total [1] 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      
With no impairment reserve recorded 761   1,423
With impairment reserve recorded 0   0
Total 761   1,423
Unpaid Principal Balance      
With no impairment reserve recorded 1,032   1,706
With impairment reserve recorded 0   0
Total 1,032   1,706
Impairment Reserve      
Impairment Reserve 0   0
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 1,066 2,146  
With impairment reserve recorded [1] 0 0  
Total [1] 1,066 2,146  
Foregone Interest Income      
With no impairment reserve recorded 30 53  
With impairment reserve recorded 0 0  
Foregone interest income 30 53  
Interest Income Recognized      
With no impairment reserve recorded 74 7  
With impairment reserve recorded 0 0  
Total 74 7  
Net Foregone Interest Income      
With no impairment reserve recorded (44) 46  
With impairment reserve recorded 0 0  
Total (44) 46  
Commercial and industrial      
Recorded Investment      
With no impairment reserve recorded 3,533   5,465
With impairment reserve recorded 12,425   6,865
Total 15,958   12,330
Unpaid Principal Balance      
With no impairment reserve recorded 5,140   6,502
With impairment reserve recorded 14,735   8,813
Total 19,875   15,315
Impairment Reserve      
Impairment Reserve 4,658   4,067
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 3,031 3,634  
With impairment reserve recorded [1] 8,699 12,288  
Total [1] 11,730 15,922  
Foregone Interest Income      
With no impairment reserve recorded 188 858  
With impairment reserve recorded 831 639  
Foregone interest income 1,019 1,497  
Interest Income Recognized      
With no impairment reserve recorded 149 7  
With impairment reserve recorded 0 0  
Total 149 7  
Net Foregone Interest Income      
With no impairment reserve recorded 39 851  
With impairment reserve recorded 831 639  
Total 870 1,490  
Direct financing leases, net      
Recorded Investment      
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(1)      
With no impairment reserve recorded [1] 0 0  
With impairment reserve recorded [1] 0 0  
Total [1] 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      
With no impairment reserve recorded 1   4
With impairment reserve recorded 0   0
Total 1   4
Unpaid Principal Balance      
With no impairment reserve recorded 1   3
With impairment reserve recorded 0   0
Total 1   3
Impairment Reserve      
Impairment Reserve 0   0
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 2 7  
With impairment reserve recorded [1] 0 0  
Total [1] 2 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 29 0  
With impairment reserve recorded 0 0  
Total 29 0  
Net Foregone Interest Income      
With no impairment reserve recorded (29) 0  
With impairment reserve recorded 0 0  
Total (29) 0  
Other      
Recorded Investment      
With no impairment reserve recorded 304   345
With impairment reserve recorded 49   9
Total 353   354
Unpaid Principal Balance      
With no impairment reserve recorded 970   1,011
With impairment reserve recorded 49   9
Total 1,019   1,020
Impairment Reserve      
Impairment Reserve 49   $ 9
Average Recorded Investment(1)      
With no impairment reserve recorded [1] 313 365  
With impairment reserve recorded [1] 8 0  
Total [1] 321 365  
Foregone Interest Income      
With no impairment reserve recorded 28 59  
With impairment reserve recorded 0 0  
Foregone interest income 28 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 28 59  
With impairment reserve recorded 0 0  
Total $ 28 $ 59  
[1] (1)Average recorded investment is calculated primarily using daily average balances.