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Allowance for Loan and Lease Loss and Credit Quality (Impaired Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 81,591 $ 65,828
Recorded Investment, Without Allowance 34,398 13,259
Recorded Investment, With Allowance 38,559 40,715
Related Allowance 1,165 867
Commercial real estate | Non-owner occupied term, net    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 18,726 19,797
Recorded Investment, Without Allowance 2,143 278
Recorded Investment, With Allowance 16,485 19,116
Related Allowance 319 524
Commercial real estate | Owner occupied term, net    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 10,617 8,467
Recorded Investment, Without Allowance 4,216 1,768
Recorded Investment, With Allowance 6,039 6,445
Related Allowance 284 131
Commercial real estate | Multifamily, net    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,998 4,015
Recorded Investment, Without Allowance 366 476
Recorded Investment, With Allowance 3,519 3,520
Related Allowance 141 123
Commercial real estate | Construction & development, net    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,091 1,091
Recorded Investment, Without Allowance 1,091 0
Recorded Investment, With Allowance 0 1,091
Related Allowance 0 9
Commercial real estate | Residential development, net    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 6,974 7,304
Recorded Investment, Without Allowance 6,153 0
Recorded Investment, With Allowance 820 7,304
Related Allowance 5 72
Commercial | Term, net    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 28,340 16,875
Recorded Investment, Without Allowance 16,911 5,982
Recorded Investment, With Allowance 5,044 3,239
Related Allowance 113 8
Commercial | LOC & other, net    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 11,845 8,279
Recorded Investment, Without Allowance 3,518 4,755
Recorded Investment, With Allowance 6,652 0
Related Allowance $ 303 $ 0