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Purchased Credit Impaired ("PCI") Loans - Rollforward of PCI Loans, Net of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 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
Acquisitions 49,155  
Principal reductions and interest payments (16,319) (20,417)
Accretion of loan discount 5,473 4,984
Changes in contractual and expected cash flows due to remeasurement 8,036 9,262
Reductions due to disposals (3,186) (17,396)
Balance at end of period 77,084 41,016
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
Acquisitions 68,763  
Principal reductions and interest payments (16,319) (20,417)
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement 11,110 9,194
Reductions due to disposals (6,393) (27,888)
Balance at end of period 123,164 77,578
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
Acquisitions 14,296  
Principal reductions and interest payments 0 0
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement (702) 975
Reductions due to disposals (1,612) (6,779)
Balance at end of period 30,884 20,961
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
Acquisitions 5,312  
Principal reductions and interest payments 0 0
Accretion of loan discount 5,473 4,984
Changes in contractual and expected cash flows due to remeasurement 3,776 (1,043)
Reductions due to disposals (1,595) (3,713)
Balance at end of period $ 15,196 $ 15,601