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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
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Recorded investment    
With no impairment reserve recorded $ 11,663 $ 15,175
With impairment reserve recorded 7,826 8,858
Total 19,489 24,033
Unpaid principal balance    
With no impairment reserve recorded 15,102 19,026
With impairment reserve recorded 7,832 8,863
Total 22,934 27,889
Impairment reserve    
Impairment reserve 897 1,113
Average recorded investment(1)    
With no impairment reserve recorded 12,848 [1] 9,721 [2]
With impairment reserve recorded 7,801 [1] 1,722 [2]
Total 20,649 [1] 11,443 [2]
Foregone interest income    
With no impairment reserve recorded 150 597
With impairment reserve recorded 161 153
Foregone interest income 311 750
Interest income recognized    
With no impairment reserve recorded 152 85
With impairment reserve recorded 0 2
Total 152 87
Net foregone interest income    
With no impairment reserve recorded (2) 512
With impairment reserve recorded 161 151
Total 159 663
Commercial real estate — owner occupied    
Recorded investment    
With no impairment reserve recorded 2,255 2,164
With impairment reserve recorded 631 814
Total 2,886 2,978
Unpaid principal balance    
With no impairment reserve recorded 2,255 2,164
With impairment reserve recorded 631 814
Total 2,886 2,978
Impairment reserve    
Impairment reserve 18 20
Average recorded investment(1)    
With no impairment reserve recorded 2,140 [1] 712 [2]
With impairment reserve recorded 628 [1] 215 [2]
Total 2,768 [1] 927 [2]
Foregone interest income    
With no impairment reserve recorded 35 53
With impairment reserve recorded 9 7
Foregone interest income 44 60
Interest income recognized    
With no impairment reserve recorded 0 12
With impairment reserve recorded 0 2
Total 0 14
Net foregone interest income    
With no impairment reserve recorded 35 41
With impairment reserve recorded 9 5
Total 44 46
Commercial real estate — non-owner occupied    
Recorded investment    
With no impairment reserve recorded 899 2,314
With impairment reserve recorded 0 0
Total 899 2,314
Unpaid principal balance    
With no impairment reserve recorded 939 2,355
With impairment reserve recorded 0 0
Total 939 2,355
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 1,843 [1] 962 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 1,843 [1] 962 [2]
Foregone interest income    
With no impairment reserve recorded 6 25
With impairment reserve recorded 0 0
Foregone interest income 6 25
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 6 25
With impairment reserve recorded 0 0
Total 6 25
Construction and land development    
Recorded investment    
With no impairment reserve recorded 4,701 4,533
With impairment reserve recorded 0 397
Total 4,701 4,930
Unpaid principal balance    
With no impairment reserve recorded 7,372 7,203
With impairment reserve recorded 0 397
Total 7,372 7,600
Impairment reserve    
Impairment reserve 0 48
Average recorded investment(1)    
With no impairment reserve recorded 4,935 [1] 4,807 [2]
With impairment reserve recorded 0 [1] 34 [2]
Total 4,935 [1] 4,841 [2]
Foregone interest income    
With no impairment reserve recorded 34 133
With impairment reserve recorded 0 0
Foregone interest income 34 133
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 34 133
With impairment reserve recorded 0 0
Total 34 133
Multi-family    
Recorded investment    
With no impairment reserve recorded 0 2
With impairment reserve recorded 0 0
Total 0 2
Unpaid principal balance    
With no impairment reserve recorded 0 369
With impairment reserve recorded 0 0
Total 0 369
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 1 [1] 10 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 1 [1] 10 [2]
Foregone interest income    
With no impairment reserve recorded 1 27
With impairment reserve recorded 0 0
Foregone interest income 1 27
Interest income recognized    
With no impairment reserve recorded 134 0
With impairment reserve recorded 0 0
Total 134 0
Net foregone interest income    
With no impairment reserve recorded (133) 27
With impairment reserve recorded 0 0
Total (133) 27
1-4 family    
Recorded investment    
With no impairment reserve recorded 2,442 2,423
With impairment reserve recorded 856 945
Total 3,298 3,368
Unpaid principal balance    
With no impairment reserve recorded 2,504 2,486
With impairment reserve recorded 862 950
Total 3,366 3,436
Impairment reserve    
Impairment reserve 126 173
Average recorded investment(1)    
With no impairment reserve recorded 2,658 [1] 1,604 [2]
With impairment reserve recorded 851 [1] 605 [2]
Total 3,509 [1] 2,209 [2]
Foregone interest income    
With no impairment reserve recorded 30 82
With impairment reserve recorded 7 34
Foregone interest income 37 116
Interest income recognized    
With no impairment reserve recorded 0 4
With impairment reserve recorded 0 0
Total 0 4
Net foregone interest income    
With no impairment reserve recorded 30 78
With impairment reserve recorded 7 34
Total 37 112
Commercial and industrial    
Recorded investment    
With no impairment reserve recorded 481 2,546
With impairment reserve recorded 6,240 6,603
Total 6,721 9,149
Unpaid principal balance    
With no impairment reserve recorded 481 2,590
With impairment reserve recorded 6,240 6,603
Total 6,721 9,193
Impairment reserve    
Impairment reserve 730 847
Average recorded investment(1)    
With no impairment reserve recorded 106 [1] 544 [2]
With impairment reserve recorded 6,224 [1] 810 [2]
Total 6,330 [1] 1,354 [2]
Foregone interest income    
With no impairment reserve recorded 22 172
With impairment reserve recorded 143 102
Foregone interest income 165 274
Interest income recognized    
With no impairment reserve recorded 18 6
With impairment reserve recorded 0 0
Total 18 6
Net foregone interest income    
With no impairment reserve recorded 4 166
With impairment reserve recorded 143 102
Total 147 268
Direct financing leases, net    
Recorded investment    
With no impairment reserve recorded 0 38
With impairment reserve recorded 0 0
Total 0 38
Unpaid principal balance    
With no impairment reserve recorded 0 38
With impairment reserve recorded 0 0
Total 0 38
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 23 [1] 4 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 23 [1] 4 [2]
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 244 500
With impairment reserve recorded 99 99
Total 343 599
Unpaid principal balance    
With no impairment reserve recorded 244 500
With impairment reserve recorded 99 99
Total 343 599
Impairment reserve    
Impairment reserve 23 25
Average recorded investment(1)    
With no impairment reserve recorded 493 [1] 390 [2]
With impairment reserve recorded 98 [1] 58 [2]
Total 591 [1] 448 [2]
Foregone interest income    
With no impairment reserve recorded 2 23
With impairment reserve recorded 2 10
Foregone interest income 4 33
Interest income recognized    
With no impairment reserve recorded 0 63
With impairment reserve recorded 0 0
Total 0 63
Net foregone interest income    
With no impairment reserve recorded 2 (40)
With impairment reserve recorded 2 10
Total 4 (30)
Other    
Recorded investment    
With no impairment reserve recorded 641 655
With impairment reserve recorded 0 0
Total 641 655
Unpaid principal balance    
With no impairment reserve recorded 1,307 1,321
With impairment reserve recorded 0 0
Total 1,307 1,321
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 649 [1] 688 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 649 [1] 688 [2]
Foregone interest income    
With no impairment reserve recorded 20 82
With impairment reserve recorded 0 0
Foregone interest income 20 82
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 20 82
With impairment reserve recorded 0 0
Total $ 20 $ 82
[1] (1)Average recorded investment is calculated primarily using daily average balances.
[2] (1)Average recorded investment is calculated primarily using daily average balances.