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Purchased Credit Impaired ("PCI") Loans - Rollforward of PCI Loans, Net of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period $ 33,925 $ 64,583
Principal reductions and interest payments (24,530) (25,669)
Acquisitions (49,155)  
Accretion of loan discount 7,573 6,155
Changes in contractual and expected cash flows due to remeasurement (9,957) (12,452)
Reductions due to disposals (6,337) (23,596)
Balance at end of period 69,743 33,925
Contractual Cashflows    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 66,003 116,689
Principal reductions and interest payments (24,530) (25,669)
Acquisitions (68,763)  
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement (13,978) (11,718)
Reductions due to disposals (11,503) (36,735)
Balance at end of period 112,711 66,003
Non-accretable Difference    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 18,902 26,765
Principal reductions and interest payments 0 0
Acquisitions (14,296)  
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement (1,465) (766)
Reductions due to disposals (2,727) (8,629)
Balance at end of period 29,006 18,902
Accretable Yield    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 13,176 25,341
Principal reductions and interest payments 0 0
Acquisitions (5,312)  
Accretion of loan discount 7,573 6,155
Changes in contractual and expected cash flows due to remeasurement (5,486) (1,500)
Reductions due to disposals (2,439) (4,510)
Balance at end of period $ 13,962 $ 13,176