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Allowance for Loan and Lease Losses - Average Recorded Investment and Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Originated Loans and Leases        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance $ 10,394 $ 10,665 $ 11,300 $ 9,521
Interest Income Recognized With No Related Allowance 0 0 0 0
Average Recorded Investment With Related Allowance 1,133 713 355 689
Interest Income Recognized With Related Allowance 0 0 0 0
Average Recorded Investment 11,527 11,378 11,655 10,210
Interest Income Recognized 0 0 0 0
Total Acquired Loans        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 2,956 5,652 4,206 6,132
Interest Income Recognized With No Related Allowance 0 0 0 0
Average Recorded Investment With Related Allowance 267 78 267 54
Interest Income Recognized With Related Allowance 0 0 0 0
Average Recorded Investment 3,223 5,730 4,473 6,186
Interest Income Recognized 0 0 0 0
Commercial and industrial | Originated Loans and Leases | Other financing receivable        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 404 146 290 476
Interest Income Recognized With No Related Allowance 0 0 0 0
Average Recorded Investment With Related Allowance 1,083 77 335 48
Interest Income Recognized With Related Allowance 0 0 0 0
Commercial and industrial | Total Acquired Loans | Other financing receivable        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 0 6 66 303
Interest Income Recognized With No Related Allowance 0 0 0 0
Commercial real estate | Originated Loans and Leases | Other financing receivable        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 6,409 7,422 7,569 6,351
Interest Income Recognized With No Related Allowance 0 0 0 0
Average Recorded Investment With Related Allowance 50 636 20 641
Interest Income Recognized With Related Allowance 0 0 0 0
Commercial real estate | Total Acquired Loans | Other financing receivable        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 1,516 4,201 2,402 4,320
Interest Income Recognized With No Related Allowance 0 0 0 0
Average Recorded Investment With Related Allowance 267 78 267 54
Interest Income Recognized With Related Allowance 0 0 0 0
Commercial real estate | Total Acquired Loans | Construction        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 0 126 16 242
Interest Income Recognized With No Related Allowance 0 0 0 0
Residential real estate | Originated Loans and Leases | Home equity        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 3,581 3,097 3,441 2,694
Interest Income Recognized With No Related Allowance 0 0 0 0
Residential real estate | Total Acquired Loans | Home equity        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment With No Related Allowance 1,440 1,319 1,722 1,267
Interest Income Recognized With No Related Allowance $ 0 $ 0 $ 0 $ 0