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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, 2015
Dec. 31, 2014
Recorded investment    
With no impairment reserve recorded $ 15,657 $ 11,270
With impairment reserve recorded 1,903 525
Total 17,560 11,795
Unpaid principal balance    
With no impairment reserve recorded 19,445 15,623
With impairment reserve recorded 1,948 565
Total 21,393 16,188
Impairment reserve    
Impairment reserve 560 290
Average recorded investment(1)    
With no impairment reserve recorded 12,032 [1] 13,926 [2]
With impairment reserve recorded 915 [1] 548 [2]
Total 12,947 [1] 14,474 [2]
Foregone interest income    
With no impairment reserve recorded 407 843
With impairment reserve recorded 46 27
Foregone interest income 453 870
Interest income recognized    
With no impairment reserve recorded 12 740
With impairment reserve recorded 0 0
Total 12 740
Net foregone interest income    
With no impairment reserve recorded 395 103
With impairment reserve recorded 46 27
Total 441 130
Commercial real estate — owner occupied    
Recorded investment    
With no impairment reserve recorded 642 577
With impairment reserve recorded 0 0
Total 642 577
Unpaid principal balance    
With no impairment reserve recorded 642 577
With impairment reserve recorded 0 0
Total 642 577
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 566 [1] 484 [2]
With impairment reserve recorded 17 [1] 0 [2]
Total 583 [1] 484 [2]
Foregone interest income    
With no impairment reserve recorded 21 30
With impairment reserve recorded 0 0
Foregone interest income 21 30
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 21 (49)
With impairment reserve recorded 0 0
Total 21 (49)
Commercial real estate — non-owner occupied    
Recorded investment    
With no impairment reserve recorded 1,439 921
With impairment reserve recorded 45 49
Total 1,484 970
Unpaid principal balance    
With no impairment reserve recorded 1,439 921
With impairment reserve recorded 85 89
Total 1,524 1,010
Impairment reserve    
Impairment reserve 45 49
Average recorded investment(1)    
With no impairment reserve recorded 915 [1] 349 [2]
With impairment reserve recorded 47 [1] 52 [2]
Total 962 [1] 401 [2]
Foregone interest income    
With no impairment reserve recorded 15 22
With impairment reserve recorded 2 4
Foregone interest income 17 26
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 15 22
With impairment reserve recorded 2 4
Total 17 26
Construction and land development    
Recorded investment    
With no impairment reserve recorded 4,566 5,157
With impairment reserve recorded 0 0
Total 4,566 5,157
Unpaid principal balance    
With no impairment reserve recorded 7,236 7,828
With impairment reserve recorded 0 0
Total 7,236 7,828
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 4,916 [1] 5,285 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 4,916 [1] 5,285 [2]
Foregone interest income    
With no impairment reserve recorded 102 155
With impairment reserve recorded 0 0
Foregone interest income 102 155
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 102 155
With impairment reserve recorded 0 0
Total 102 155
Multi-family    
Recorded investment    
With no impairment reserve recorded 6 17
With impairment reserve recorded 0 0
Total 6 17
Unpaid principal balance    
With no impairment reserve recorded 373 384
With impairment reserve recorded 0 0
Total 373 384
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 12 [1] 24 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 12 [1] 24 [2]
Foregone interest income    
With no impairment reserve recorded 25 53
With impairment reserve recorded 0 0
Foregone interest income 25 53
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 25 53
With impairment reserve recorded 0 0
Total 25 53
1-4 family    
Recorded investment    
With no impairment reserve recorded 1,291 1,181
With impairment reserve recorded 988 390
Total 2,279 1,571
Unpaid principal balance    
With no impairment reserve recorded 1,365 1,218
With impairment reserve recorded 993 390
Total 2,358 1,608
Impairment reserve    
Impairment reserve 213 155
Average recorded investment(1)    
With no impairment reserve recorded 1,509 [1] 380 [2]
With impairment reserve recorded 560 [1] 405 [2]
Total 2,069 [1] 785 [2]
Foregone interest income    
With no impairment reserve recorded 46 15
With impairment reserve recorded 25 18
Foregone interest income 71 33
Interest income recognized    
With no impairment reserve recorded 2 12
With impairment reserve recorded 0 0
Total 2 12
Net foregone interest income    
With no impairment reserve recorded 44 3
With impairment reserve recorded 25 18
Total 69 21
Commercial and industrial    
Recorded investment    
With no impairment reserve recorded 6,742 2,316
With impairment reserve recorded 739 33
Total 7,481 2,349
Unpaid principal balance    
With no impairment reserve recorded 6,752 2,926
With impairment reserve recorded 739 33
Total 7,491 2,959
Impairment reserve    
Impairment reserve 276 33
Average recorded investment(1)    
With no impairment reserve recorded 3,052 [1] 6,141 [2]
With impairment reserve recorded 215 [1] 34 [2]
Total 3,267 [1] 6,175 [2]
Foregone interest income    
With no impairment reserve recorded 121 463
With impairment reserve recorded 12 0
Foregone interest income 133 463
Interest income recognized    
With no impairment reserve recorded 1 649
With impairment reserve recorded 0 0
Total 1 649
Net foregone interest income    
With no impairment reserve recorded 120 (186)
With impairment reserve recorded 12 0
Total 132 (186)
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 0 [1] 0 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 0 [1] 0 [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 301 380
With impairment reserve recorded 131 53
Total 432 433
Unpaid principal balance    
With no impairment reserve recorded 301 380
With impairment reserve recorded 131 53
Total 432 433
Impairment reserve    
Impairment reserve 26 53
Average recorded investment(1)    
With no impairment reserve recorded 366 [1] 495 [2]
With impairment reserve recorded 76 [1] 57 [2]
Total 442 [1] 552 [2]
Foregone interest income    
With no impairment reserve recorded 16 18
With impairment reserve recorded 7 5
Foregone interest income 23 23
Interest income recognized    
With no impairment reserve recorded 9 0
With impairment reserve recorded 0 0
Total 9 0
Net foregone interest income    
With no impairment reserve recorded 7 18
With impairment reserve recorded 7 5
Total 14 23
Other    
Recorded investment    
With no impairment reserve recorded 670 721
With impairment reserve recorded 0 0
Total 670 721
Unpaid principal balance    
With no impairment reserve recorded 1,337 1,389
With impairment reserve recorded 0 0
Total 1,337 1,389
Impairment reserve    
Impairment reserve 0 0
Average recorded investment(1)    
With no impairment reserve recorded 696 [1] 768 [2]
With impairment reserve recorded 0 [1] 0 [2]
Total 696 [1] 768 [2]
Foregone interest income    
With no impairment reserve recorded 61 87
With impairment reserve recorded 0 0
Foregone interest income 61 87
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 61 87
With impairment reserve recorded 0 0
Total $ 61 $ 87
[1] (1)Average recorded investment is calculated primarily using daily average balances.
[2] (1)Average recorded investment is calculated primarily using daily average balances.