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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, 2017
Dec. 31, 2016
Recorded Investment    
With no impairment reserve recorded $ 17,972 $ 11,345
With impairment reserve recorded 15,535 14,566
Total 33,507 25,911
Unpaid Principal Balance    
With no impairment reserve recorded 21,967 14,722
With impairment reserve recorded 16,008 14,572
Total 37,975 29,294
Impairment Reserve    
Impairment Reserve 5,790 5,599
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 20,232 13,371
With impairment reserve recorded [1] 14,639 9,615
Total [1] 34,871 22,986
Foregone Interest Income    
With no impairment reserve recorded 1,389 838
With impairment reserve recorded 580 779
Foregone interest income 1,969 1,617
Interest Income Recognized    
With no impairment reserve recorded 0 614
With impairment reserve recorded 0 0
Total 0 614
Net Foregone Interest Income    
With no impairment reserve recorded 1,389 224
With impairment reserve recorded 580 779
Total 1,969 1,003
Commercial real estate — owner occupied    
Recorded Investment    
With no impairment reserve recorded 6,727 1,788
With impairment reserve recorded 411 499
Total 7,138 2,287
Unpaid Principal Balance    
With no impairment reserve recorded 6,727 1,788
With impairment reserve recorded 411 499
Total 7,138 2,287
Impairment Reserve    
Impairment Reserve 15 70
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 4,898 3,577
With impairment reserve recorded [1] 424 111
Total [1] 5,322 3,688
Foregone Interest Income    
With no impairment reserve recorded 394 328
With impairment reserve recorded 19 28
Foregone interest income 413 356
Interest Income Recognized    
With no impairment reserve recorded 0 118
With impairment reserve recorded 0 0
Total 0 118
Net Foregone Interest Income    
With no impairment reserve recorded 394 210
With impairment reserve recorded 19 28
Total 413 238
Commercial real estate — non-owner occupied    
Recorded Investment    
With no impairment reserve recorded 1,826 1,609
With impairment reserve recorded 0 0
Total 1,826 1,609
Unpaid Principal Balance    
With no impairment reserve recorded 1,866 1,647
With impairment reserve recorded 0 0
Total 1,866 1,647
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 1,932 1,318
With impairment reserve recorded [1] 0 0
Total [1] 1,932 1,318
Foregone Interest Income    
With no impairment reserve recorded 99 91
With impairment reserve recorded 0 0
Foregone interest income 99 91
Interest Income Recognized    
With no impairment reserve recorded 0 79
With impairment reserve recorded 0 0
Total 0 79
Net Foregone Interest Income    
With no impairment reserve recorded 99 12
With impairment reserve recorded 0 0
Total 99 12
Land development    
Recorded Investment    
With no impairment reserve recorded 2,770 3,440
With impairment reserve recorded 0 0
Total 2,770 3,440
Unpaid Principal Balance    
With no impairment reserve recorded 5,441 6,111
With impairment reserve recorded 0 0
Total 5,441 6,111
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 3,218 3,898
With impairment reserve recorded [1] 0 0
Total [1] 3,218 3,898
Foregone Interest Income    
With no impairment reserve recorded 65 107
With impairment reserve recorded 0 0
Foregone interest income 65 107
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 65 107
With impairment reserve recorded 0 0
Total 65 107
Construction    
Recorded Investment    
With no impairment reserve recorded 2,482 436
With impairment reserve recorded 2,872 2,482
Total 5,354 2,918
Unpaid Principal Balance    
With no impairment reserve recorded 2,482 438
With impairment reserve recorded 2,872 2,482
Total 5,354 2,920
Impairment Reserve    
Impairment Reserve 94 1,790
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 611 291
With impairment reserve recorded [1] 4,091 834
Total [1] 4,702 1,125
Foregone Interest Income    
With no impairment reserve recorded 208 20
With impairment reserve recorded 108 45
Foregone interest income 316 65
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 208 20
With impairment reserve recorded 108 45
Total 316 65
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] 1 0
With impairment reserve recorded [1] 0 0
Total [1] 1 0
Foregone Interest Income    
With no impairment reserve recorded 0 1
With impairment reserve recorded 0 0
Foregone interest income 0 1
Interest Income Recognized    
With no impairment reserve recorded 0 134
With impairment reserve recorded 0 0
Total 0 134
Net Foregone Interest Income    
With no impairment reserve recorded 0 (133)
With impairment reserve recorded 0 0
Total 0 (133)
1-4 family    
Recorded Investment    
With no impairment reserve recorded 2,065 2,379
With impairment reserve recorded 0 193
Total 2,065 2,572
Unpaid Principal Balance    
With no impairment reserve recorded 2,319 2,379
With impairment reserve recorded 0 199
Total 2,319 2,578
Impairment Reserve    
Impairment Reserve 0 39
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 2,387 2,755
With impairment reserve recorded [1] 0 203
Total [1] 2,387 2,958
Foregone Interest Income    
With no impairment reserve recorded 69 125
With impairment reserve recorded 0 5
Foregone interest income 69 130
Interest Income Recognized    
With no impairment reserve recorded 0 94
With impairment reserve recorded 0 0
Total 0 94
Net Foregone Interest Income    
With no impairment reserve recorded 69 31
With impairment reserve recorded 0 5
Total 69 36
Commercial and industrial    
Recorded Investment    
With no impairment reserve recorded 1,740 1,307
With impairment reserve recorded 12,229 11,166
Total 13,969 12,473
Unpaid Principal Balance    
With no impairment reserve recorded 2,103 1,307
With impairment reserve recorded 12,702 11,166
Total 14,805 12,473
Impairment Reserve    
Impairment Reserve 5,658 3,700
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 6,782 709
With impairment reserve recorded [1] 10,114 8,448
Total [1] 16,896 9,157
Foregone Interest Income    
With no impairment reserve recorded 509 79
With impairment reserve recorded 453 701
Foregone interest income 962 780
Interest Income Recognized    
With no impairment reserve recorded 0 62
With impairment reserve recorded 0 0
Total 0 62
Net Foregone Interest Income    
With no impairment reserve recorded 509 17
With impairment reserve recorded 453 701
Total 962 718
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 6
With impairment reserve recorded [1] 0 0
Total [1] 0 6
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 4 8
With impairment reserve recorded 0 0
Total 4 8
Unpaid Principal Balance    
With no impairment reserve recorded 4 8
With impairment reserve recorded 0 0
Total 4 8
Impairment Reserve    
Impairment Reserve 0 0
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 6 307
With impairment reserve recorded [1] 0 0
Total [1] 6 307
Foregone Interest Income    
With no impairment reserve recorded 0 16
With impairment reserve recorded 0 0
Foregone interest income 0 16
Interest Income Recognized    
With no impairment reserve recorded 0 127
With impairment reserve recorded 0 0
Total 0 127
Net Foregone Interest Income    
With no impairment reserve recorded 0 (111)
With impairment reserve recorded 0 0
Total 0 (111)
Other    
Recorded Investment    
With no impairment reserve recorded 358 378
With impairment reserve recorded 23 226
Total 381 604
Unpaid Principal Balance    
With no impairment reserve recorded 1,025 1,044
With impairment reserve recorded 23 226
Total 1,048 1,270
Impairment Reserve    
Impairment Reserve 23 0
Average Recorded Investment(1)    
With no impairment reserve recorded [1] 397 510
With impairment reserve recorded [1] 10 19
Total [1] 407 529
Foregone Interest Income    
With no impairment reserve recorded 45 71
With impairment reserve recorded 0 0
Foregone interest income 45 71
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 45 71
With impairment reserve recorded 0 0
Total $ 45 $ 71
[1] (1)Average recorded investment is calculated primarily using daily average balances.