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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Balance at beginning of period $ 287,992 $ 332,525 $ 308,913 $ 354,701
Accretion Accretable 11,253 16,282 34,498 46,441
Change in expected cash flow 1,362 3,766 8,250 20,195
Transfer from (to) non-accretable discount 293 (9,090) (4,271) (17,536)
Balance at end of period 278,394 310,919 278,394 310,919
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 350,257 366,762 352,431 363,107
Change in actual and expected losses (2,791) (11,304) (9,529) (16,095)
Transfer (to) from accretable yield (293) 9,090 4,271 17,536
Balance at end of period 347,173 364,548 347,173 364,548
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 243,903 270,148 258,498 292,115
Accretion Accretable 6,722 7,434 20,710 23,018
Change in expected cash flow 0 0 0 2
Transfer from (to) non-accretable discount 1,456 (6,158) 849 (12,543)
Balance at end of period 238,637 256,556 238,637 256,556
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 296,137 306,504 299,501 305,615
Change in actual and expected losses (1,860) (2,310) (5,831) (7,806)
Transfer (to) from accretable yield (1,456) 6,158 (849) 12,543
Balance at end of period 292,821 310,352 292,821 310,352
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 42,521 56,038 46,764 50,366
Accretion Accretable 3,977 7,114 11,259 16,608
Change in expected cash flow 1,334 3,716 7,265 19,907
Transfer from (to) non-accretable discount (1,140) (2,950) (4,032) (3,975)
Balance at end of period 38,738 49,690 38,738 49,690
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 11,143 16,867 10,596 16,965
Change in actual and expected losses (1,125) (8,679) (3,470) (9,802)
Transfer (to) from accretable yield 1,140 2,950 4,032 3,975
Balance at end of period 11,158 11,138 11,158 11,138
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 1,071 4,853 2,766 8,538
Accretion Accretable 466 1,350 1,991 5,273
Change in expected cash flow 3 13 829 163
Transfer from (to) non-accretable discount 3 (8) (993) 80
Balance at end of period 611 3,508 611 3,508
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 23,645 23,960 23,050 22,407
Change in actual and expected losses 181 (191) (220) 1,450
Transfer (to) from accretable yield (3) 8 993 (80)
Balance at end of period 23,823 23,777 23,823 23,777
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 497 1,486 885 3,682
Accretion Accretable 88 384 538 1,542
Change in expected cash flow 25 37 156 123
Transfer from (to) non-accretable discount (26) 26 (95) (1,098)
Balance at end of period 408 1,165 408 1,165
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 19,332 19,431 19,284 18,120
Change in actual and expected losses 13 (124) (8) 63
Transfer (to) from accretable yield 26 (26) 95 1,098
Balance at end of period $ 19,371 $ 19,281 $ 19,371 $ 19,281