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Loans Receivable (Accretable yield and non-accretable discount activity) (Details) - Acquired under ASC 310-30 Non-Covered Loans [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period $ 354,701 $ 361,688
Accretion Accretable 15,620 21,164
Change in expected cash flow 287 329
Transfer from (to) non-accretable discount (6,008) (190)
Balance at end of period 333,360 340,663
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 363,107 434,190
Change in actual and expected losses (3,596) (5,404)
Transfer (to) from accretable yield 6,008 190
Balance at end of period 365,519 428,976
Mortgage Loan [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 292,115 268,794
Accretion Accretable 7,890 8,307
Change in expected cash flow 1 0
Transfer from (to) non-accretable discount (7,409) 70
Balance at end of period 276,817 260,557
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 305,615 374,772
Change in actual and expected losses (3,031) (4,547)
Transfer (to) from accretable yield 7,409 (70)
Balance at end of period 309,993 370,155
Commercial Loan [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 50,366 65,026
Accretion Accretable 4,981 7,708
Change in expected cash flow 198 328
Transfer from (to) non-accretable discount 1,319 (388)
Balance at end of period 46,902 57,258
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 16,965 18,545
Change in actual and expected losses (843) (785)
Transfer (to) from accretable yield (1,319) 388
Balance at end of period 14,803 18,148
Auto Loan [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 8,538 21,578
Accretion Accretable 2,147 4,211
Change in expected cash flow 52 1
Transfer from (to) non-accretable discount 140 219
Balance at end of period 6,583 17,587
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 22,407 22,039
Change in actual and expected losses 297 118
Transfer (to) from accretable yield (140) (219)
Balance at end of period 22,564 21,938
Consumer Loan [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 3,682 6,290
Accretion Accretable 602 938
Change in expected cash flow 36 0
Transfer from (to) non-accretable discount (58) (91)
Balance at end of period 3,058 5,261
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 18,120 18,834
Change in actual and expected losses (19) (190)
Transfer (to) from accretable yield 58 91
Balance at end of period $ 18,159 $ 18,735