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Allowance for Loan Losses - Investments in Loans Considered to be Impaired and Related Information on Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
With a related allowance recorded, Recorded Investment $ 13,582   $ 13,582   $ 9,132
With a related allowance recorded, Unpaid Principal Balance 14,822   14,822   9,141
Impaired financing receivable, Related Allowance 2,144   2,144   1,763
Without a related allowance recorded, Recorded Investment 58,958   58,958   40,374
Without a related allowance, Unpaid Principal Balance 68,512   68,512   47,349
Impaired Financing Receivable, Recorded Investment, Total 72,540   72,540   49,506
Impaired Financing Receivable, Total Unpaid Principal Balance, Total 83,334   83,334   56,490
With a related allowance recorded, Average Recorded Investment 14,756 $ 528 14,851 $ 622  
With a related allowance recorded, Interest Income Recognized 0 1 1 2  
Without a related allowance recorded, Average Recorded Investment 58,338 30,298 57,747 28,321  
Without a related allowance recorded, Interest Income Recognized 478 287 1,434 862  
Impaired financing receivable, Average Recorded Investment, Total 73,094 30,826 72,598 28,943  
Impaired financing Receivable, Interest Income Recognized, Total 478 288 1,435 864  
Commercial real estate          
Financing Receivable, Impaired [Line Items]          
With a related allowance recorded, Recorded Investment 13,081   13,081   7,733
With a related allowance recorded, Unpaid Principal Balance 14,322   14,322   7,733
Impaired financing receivable, Related Allowance 2,006   2,006   1,295
Without a related allowance recorded, Recorded Investment 38,368   38,368   3,636
Without a related allowance, Unpaid Principal Balance 42,784   42,784   4,046
Impaired Financing Receivable, Recorded Investment, Total 51,449   51,449   11,369
Impaired Financing Receivable, Total Unpaid Principal Balance, Total 57,106   57,106   11,779
With a related allowance recorded, Average Recorded Investment 14,255 0 14,348 0  
With a related allowance recorded, Interest Income Recognized 0 0 0 0  
Without a related allowance recorded, Average Recorded Investment 39,179 3,744 39,788 3,895  
Without a related allowance recorded, Interest Income Recognized 231 41 712 126  
Impaired financing receivable, Average Recorded Investment, Total 53,434 3,744 54,136 3,895  
Impaired financing Receivable, Interest Income Recognized, Total 231 41 712 126  
Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
With a related allowance recorded, Recorded Investment 0   0   884
With a related allowance recorded, Unpaid Principal Balance 0   0   893
Impaired financing receivable, Related Allowance 0   0   360
Without a related allowance recorded, Recorded Investment 9,852   9,852   12,788
Without a related allowance, Unpaid Principal Balance 12,582   12,582   14,452
Impaired Financing Receivable, Recorded Investment, Total 9,852   9,852   13,672
Impaired Financing Receivable, Total Unpaid Principal Balance, Total 12,582   12,582   15,345
With a related allowance recorded, Average Recorded Investment 0 0 0 0  
With a related allowance recorded, Interest Income Recognized 0 0 0 0  
Without a related allowance recorded, Average Recorded Investment 8,008 14,412 6,644 11,567  
Without a related allowance recorded, Interest Income Recognized 116 73 308 232  
Impaired financing receivable, Average Recorded Investment, Total 8,008 14,412 6,644 11,567  
Impaired financing Receivable, Interest Income Recognized, Total 116 73 308 232  
Commercial construction          
Financing Receivable, Impaired [Line Items]          
With a related allowance recorded, Recorded Investment 490   490   489
With a related allowance recorded, Unpaid Principal Balance 490   490   489
Impaired financing receivable, Related Allowance 128   128   87
Without a related allowance recorded, Recorded Investment 2,318   2,318   15,286
Without a related allowance, Unpaid Principal Balance 3,828   3,828   19,198
Impaired Financing Receivable, Recorded Investment, Total 2,808   2,808   15,775
Impaired Financing Receivable, Total Unpaid Principal Balance, Total 4,318   4,318   19,687
With a related allowance recorded, Average Recorded Investment 490 496 490 585  
With a related allowance recorded, Interest Income Recognized 0 0 0 0  
Without a related allowance recorded, Average Recorded Investment 2,318 2,809 2,318 2,813  
Without a related allowance recorded, Interest Income Recognized 34 61 117 134  
Impaired financing receivable, Average Recorded Investment, Total 2,808 3,305 2,808 3,398  
Impaired financing Receivable, Interest Income Recognized, Total 34 61 117 134  
Consumer real estate          
Financing Receivable, Impaired [Line Items]          
With a related allowance recorded, Recorded Investment 0   0   15
With a related allowance recorded, Unpaid Principal Balance 0   0   14
Impaired financing receivable, Related Allowance 0   0   10
Without a related allowance recorded, Recorded Investment 8,418   8,418   8,659
Without a related allowance, Unpaid Principal Balance 9,309   9,309   9,635
Impaired Financing Receivable, Recorded Investment, Total 8,418   8,418   8,674
Impaired Financing Receivable, Total Unpaid Principal Balance, Total 9,309   9,309   9,649
With a related allowance recorded, Average Recorded Investment 0 15 0 16  
With a related allowance recorded, Interest Income Recognized 0 0 0 1  
Without a related allowance recorded, Average Recorded Investment 8,830 9,320 8,993 10,031  
Without a related allowance recorded, Interest Income Recognized 97 112 297 370  
Impaired financing receivable, Average Recorded Investment, Total 8,830 9,335 8,993 10,047  
Impaired financing Receivable, Interest Income Recognized, Total 97 112 297 371  
Other consumer          
Financing Receivable, Impaired [Line Items]          
With a related allowance recorded, Recorded Investment 11   11   11
With a related allowance recorded, Unpaid Principal Balance 10   10   12
Impaired financing receivable, Related Allowance 10   10   11
Without a related allowance recorded, Recorded Investment 2   2   5
Without a related allowance, Unpaid Principal Balance 9   9   18
Impaired Financing Receivable, Recorded Investment, Total 13   13   16
Impaired Financing Receivable, Total Unpaid Principal Balance, Total 19   19   $ 30
With a related allowance recorded, Average Recorded Investment 11 17 13 21  
With a related allowance recorded, Interest Income Recognized 0 1 1 1  
Without a related allowance recorded, Average Recorded Investment 3 13 4 15  
Without a related allowance recorded, Interest Income Recognized 0 0 0 0  
Impaired financing receivable, Average Recorded Investment, Total 14 30 17 36  
Impaired financing Receivable, Interest Income Recognized, Total $ 0 $ 1 $ 1 $ 1