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Purchased Credit Impaired ("PCI") Loans - Rollforward of PCI Loans, Net of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 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 (10,781) (11,768)
Accretion of loan discount 3,534 3,431
Changes in contractual and expected cash flows due to remeasurement 5,696 5,410
Reductions due to disposals (2,355) (13,678)
Balance at end of period 79,174 47,978
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 (10,781) (11,768)
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement 5,641 6,144
Reductions due to disposals (5,070) (21,663)
Balance at end of period 124,556 89,402
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 (1,383) 1,522
Reductions due to disposals (1,317) (4,912)
Balance at end of period 30,498 23,375
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 3,534 3,431
Changes in contractual and expected cash flows due to remeasurement 1,328 (788)
Reductions due to disposals (1,398) (3,073)
Balance at end of period $ 14,884 $ 18,049