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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, 2018
Mar. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period $ 308,913 $ 354,701
Accretion Accretable 11,883 15,620
Change in expected cash flow 3,640 287
Transfer from (to) non-accretable discount (4,205) (6,008)
Balance at end of period 296,465 333,360
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 352,431 363,107
Change in actual and expected losses (2,046) (3,596)
Transfer (to) from accretable yield 4,205 6,008
Balance at end of period 354,590 365,519
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 258,498 292,115
Accretion Accretable 7,073 7,890
Change in expected cash flow 0 1
Transfer from (to) non-accretable discount (3,046) (7,409)
Balance at end of period 248,379 276,817
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 299,501 305,615
Change in actual and expected losses (1,440) (3,031)
Transfer (to) from accretable yield 3,046 7,409
Balance at end of period 301,107 309,993
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 46,764 50,366
Accretion Accretable 3,685 4,981
Change in expected cash flow 3,156 198
Transfer from (to) non-accretable discount (524) 1,319
Balance at end of period 45,711 46,902
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 10,596 16,965
Change in actual and expected losses (389) (843)
Transfer (to) from accretable yield 524 (1,319)
Balance at end of period 10,731 14,803
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 2,766 8,538
Accretion Accretable 869 2,147
Change in expected cash flow 426 52
Transfer from (to) non-accretable discount (597) 140
Balance at end of period 1,726 6,583
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 23,050 22,407
Change in actual and expected losses (204) 297
Transfer (to) from accretable yield 597 (140)
Balance at end of period 23,443 22,564
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 885 3,682
Accretion Accretable 256 602
Change in expected cash flow 58 36
Transfer from (to) non-accretable discount (38) (58)
Balance at end of period 649 3,058
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 19,284 18,120
Change in actual and expected losses (13) (19)
Transfer (to) from accretable yield 38 58
Balance at end of period $ 19,309 $ 18,159