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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, 2016
Jun. 30, 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 (20,417) (19,315)
Accretion of loan discount 4,984 8,604
Changes in contractual and expected cash flows due to remeasurement (9,262) (11,833)
Reductions due to disposals (17,396) (12,418)
Balance at end of period 41,016 72,397
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 (20,417) (19,315)
Accretion of loan discount 0 0
Changes in contractual and expected cash flows due to remeasurement (9,194) (5,731)
Reductions due to disposals (27,888) (19,734)
Balance at end of period 77,578 133,365
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 (975) (26,797)
Reductions due to disposals (6,779) (4,183)
Balance at end of period 20,961 34,739
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 4,984 8,604
Changes in contractual and expected cash flows due to remeasurement (1,043) (9,233)
Reductions due to disposals (3,713) (3,133)
Balance at end of period $ 15,601 $ 26,229