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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Balance at beginning of period $ 333,360 $ 340,663 $ 354,701 $ 361,688
Accretion Accretable 14,539 19,359 30,159 40,523
Change in expected cash flow 16,142 3,283 16,429 3,612
Transfer from (to) non-accretable discount (2,438) 30,531 (8,446) 30,341
Balance at end of period 332,525 355,118 332,525 355,118
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 365,519 428,976 363,107 434,190
Change in actual and expected losses (1,195) (3,945) (4,791) (9,349)
Transfer (to) from accretable yield 2,438 (30,531) 8,446 (30,341)
Balance at end of period 366,762 394,500 366,762 394,500
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 276,817 260,557 292,115 268,794
Accretion Accretable 7,694 8,294 15,584 16,601
Change in expected cash flow 1 0 2 0
Transfer from (to) non-accretable discount 1,024 31,560 (6,385) 31,630
Balance at end of period 270,148 283,823 270,148 283,823
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 309,993 370,155 305,615 374,772
Change in actual and expected losses (2,465) (2,442) (5,496) (6,989)
Transfer (to) from accretable yield (1,024) (31,560) 6,385 (31,630)
Balance at end of period 306,504 336,153 306,504 336,153
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 46,902 57,258 50,366 65,026
Accretion Accretable 4,513 6,579 9,494 14,287
Change in expected cash flow 15,993 2,654 16,191 2,982
Transfer from (to) non-accretable discount (2,344) (1,026) (1,025) (1,414)
Balance at end of period 56,038 52,307 56,038 52,307
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 14,803 18,148 16,965 18,545
Change in actual and expected losses (280) (1,173) (1,123) (1,958)
Transfer (to) from accretable yield 2,344 1,026 1,025 1,414
Balance at end of period 16,867 18,001 16,867 18,001
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 6,583 17,587 8,538 21,578
Accretion Accretable 1,776 3,616 3,923 7,827
Change in expected cash flow 98 630 150 631
Transfer from (to) non-accretable discount (52) (498) 88 (279)
Balance at end of period 4,853 14,103 4,853 14,103
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 22,564 21,938 22,407 22,039
Change in actual and expected losses 1,344 (315) 1,641 (197)
Transfer (to) from accretable yield 52 498 (88) 279
Balance at end of period 23,960 22,121 23,960 22,121
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 3,058 5,261 3,682 6,290
Accretion Accretable 556 870 1,158 1,808
Change in expected cash flow 50 (1) 86 (1)
Transfer from (to) non-accretable discount (1,066) 495 (1,124) 404
Balance at end of period 1,486 4,885 1,486 4,885
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 18,159 18,735 18,120 18,834
Change in actual and expected losses 206 (15) 187 (205)
Transfer (to) from accretable yield 1,066 (495) 1,124 (404)
Balance at end of period $ 19,431 $ 18,225 $ 19,431 $ 18,225