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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, 2016
Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period $ 64,583 $ 83,693
Principal reductions and interest payments (25,669) (24,441)
Accretion of loan discount 6,155 10,775
Changes in contractual and expected cash flows due to remeasurement 12,452 14,707
Reductions due to disposals (23,596) (20,151)
Balance at end of period 33,925 64,583
Contractual Cashflows    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 116,689 178,145
Principal reductions and interest payments (25,669) (24,441)
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement 11,718 (3,574)
Reductions due to disposals (36,735) (33,441)
Balance at end of period 66,003 116,689
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 26,765 65,719
Principal reductions and interest payments 0 0
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement 766 (30,413)
Reductions due to disposals (8,629) (8,541)
Balance at end of period 18,902 26,765
Accretable Yield    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 25,341 28,733
Principal reductions and interest payments 0 0
Accretion of loan discount 6,155 10,775
Changes in contractual and expected cash flows due to remeasurement (1,500) 12,132
Reductions due to disposals (4,510) (4,749)
Balance at end of period $ 13,176 $ 25,341