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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Balance at beginning of period $ 332,525 $ 355,118 $ 354,701 $ 361,688
Accretion Accretable 16,282 18,652 46,441 59,175
Change in expected cash flow 3,766 2,139 20,195 5,751
Transfer from (to) non-accretable discount (9,090) 22,751 (17,536) 53,092
Balance at end of period 310,919 361,356 310,919 361,356
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 366,762 394,500 363,107 434,190
Change in actual and expected losses (11,304) (3,995) (16,095) (13,344)
Transfer (to) from accretable yield 9,090 (22,751) 17,536 (53,092)
Balance at end of period 364,548 367,754 364,548 367,754
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 270,148 283,823 292,115 268,794
Accretion Accretable 7,434 8,197 23,018 24,798
Change in expected cash flow 0 (1) 2 (1)
Transfer from (to) non-accretable discount (6,158) 24,056 (12,543) 55,686
Balance at end of period 256,556 299,681 256,556 299,681
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 306,504 336,153 305,615 374,772
Change in actual and expected losses (2,310) (2,591) (7,806) (9,580)
Transfer (to) from accretable yield 6,158 (24,056) 12,543 (55,686)
Balance at end of period 310,352 309,506 310,352 309,506
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 56,038 52,307 50,366 65,026
Accretion Accretable 7,114 6,686 16,608 20,973
Change in expected cash flow 3,716 1,763 19,907 4,745
Transfer from (to) non-accretable discount (2,950) (1,013) (3,975) (2,427)
Balance at end of period 49,690 46,371 49,690 46,371
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 16,867 18,001 16,965 18,545
Change in actual and expected losses (8,679) (1,216) (9,802) (3,174)
Transfer (to) from accretable yield 2,950 1,013 3,975 2,427
Balance at end of period 11,138 17,798 11,138 17,798
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 4,853 14,103 8,538 21,578
Accretion Accretable 1,350 3,107 5,273 10,934
Change in expected cash flow 13 618 163 1,249
Transfer from (to) non-accretable discount (8) (525) 80 (804)
Balance at end of period 3,508 11,089 3,508 11,089
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 23,960 22,121 22,407 22,039
Change in actual and expected losses (191) (309) 1,450 (506)
Transfer (to) from accretable yield 8 525 (80) 804
Balance at end of period 23,777 22,337 23,777 22,337
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 1,486 4,885 3,682 6,290
Accretion Accretable 384 662 1,542 2,470
Change in expected cash flow 37 (241) 123 (242)
Transfer from (to) non-accretable discount 26 233 (1,098) 637
Balance at end of period 1,165 4,215 1,165 4,215
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 19,431 18,225 18,120 18,834
Change in actual and expected losses (124) 121 63 (84)
Transfer (to) from accretable yield (26) (233) 1,098 (637)
Balance at end of period $ 19,281 $ 18,113 $ 19,281 $ 18,113