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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
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Balance at beginning of period $ 361,688 $ 445,946 $ 517,553
Accretion Accretable 75,637 112,113 153,536
Change in expected cash flow 15,267 8,531  
Transfer from (to) non-accretable discount 53,383 19,324 81,929
Balance at end of period 354,701 361,688 445,946
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 434,190 456,627 579,587
Change in actual and expected losses (17,700) (3,113) (41,031)
Transfer (to) from accretable yield (53,383) (19,324) (81,929)
Balance at end of period 363,107 434,190 456,627
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 268,794 298,364 287,841
Accretion Accretable 32,834 34,842 37,612
Change in expected cash flow (1) 0  
Transfer from (to) non-accretable discount 56,156 5,272 48,135
Balance at end of period 292,115 268,794 298,364
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 374,772 389,839 463,166
Change in actual and expected losses (13,001) (9,795) (25,192)
Transfer (to) from accretable yield (56,156) (5,272) (48,135)
Balance at end of period 305,615 374,772 389,839
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 45,411 61,196 96,139
Accretion Accretable 20,443 39,268 49,039
Change in expected cash flow 13,949 6,130  
Transfer from (to) non-accretable discount (1,800) 17,353 14,096
Balance at end of period 37,117 45,411 61,196
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 11,781 23,069 42,515
Change in actual and expected losses (3,916) 6,065 (5,350)
Transfer (to) from accretable yield 1,800 (17,353) (14,096)
Balance at end of period 9,665 11,781 23,069
Construction Loans [Member]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Balance at beginning of period 19,615 25,829 42,993
Accretion Accretable 5,811 10,161 21,894
Change in expected cash flow 310 2,402  
Transfer from (to) non-accretable discount (865) 1,545 4,730
Balance at end of period 13,249 19,615 25,829
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 6,764 3,486 5,851
Change in actual and expected losses (329) 4,823 2,365
Transfer (to) from accretable yield 865 (1,545) (4,730)
Balance at end of period 7,300 6,764 3,486
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 21,578 53,998 77,845
Accretion Accretable 13,567 23,463 39,023
Change in expected cash flow 1,251 0  
Transfer from (to) non-accretable discount (724) (8,957) 15,176
Balance at end of period 8,538 21,578 53,998
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 22,039 16,215 39,645
Change in actual and expected losses (356) (3,133) (8,254)
Transfer (to) from accretable yield 724 8,957 (15,176)
Balance at end of period 22,407 22,039 16,215
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 6,290 6,559 12,735
Accretion Accretable 2,982 4,379 5,968
Change in expected cash flow (242) (1)  
Transfer from (to) non-accretable discount 616 4,111 208
Balance at end of period 3,682 6,290 6,559
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 18,834 24,018 28,410
Change in actual and expected losses (98) (1,073) (4,600)
Transfer (to) from accretable yield (616) (4,111) 208
Balance at end of period $ 18,120 $ 18,834 $ 24,018