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Loans (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, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 361,688
Accretion Accretable 44,639 58,957 75,637
Change in expected cash flow 9,269 22,565 15,267
Transfer from (to) non-accretable discount (4,033) (9,396) 53,383
Balance at end of period 269,510 308,913 354,701
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 352,431 363,107 434,190
Change in actual and expected losses (11,041) (20,072) (17,700)
Transfer (to) from accretable yield 4,033 9,396 (53,383)
Balance at end of period 345,423 352,431 363,107
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 258,498 292,115 268,794
Accretion Accretable 27,248 30,205 32,834
Change in expected cash flow 0 2 (1)
Transfer from (to) non-accretable discount 949 (3,414) 56,156
Balance at end of period 232,199 258,498 292,115
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]      
Balance at beginning of period 299,501 305,615 374,772
Change in actual and expected losses (6,665) (9,528) (13,001)
Transfer (to) from accretable yield (949) 3,414 (56,156)
Balance at end of period 291,887 299,501 305,615
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 65,026
Accretion Accretable 14,160 20,572 26,254
Change in expected cash flow 7,895 22,250 14,259
Transfer from (to) non-accretable discount (3,991) (5,280) (2,665)
Balance at end of period 36,508 46,764 50,366
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 18,545
Change in actual and expected losses (4,241) (11,649) (4,245)
Transfer (to) from accretable yield 3,991 5,280 2,665
Balance at end of period 10,346 10,596 16,965
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 21,578
Accretion Accretable 2,360 6,339 13,567
Change in expected cash flow 890 170 1,251
Transfer from (to) non-accretable discount (1,053) 397 (724)
Balance at end of period 243 2,766 8,538
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 22,039
Change in actual and expected losses 142 1,040 (356)
Transfer (to) from accretable yield 1,053 (397) 724
Balance at end of period 24,245 23,050 22,407
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 6,290
Accretion Accretable 871 1,841 2,982
Change in expected cash flow 484 143 (242)
Transfer from (to) non-accretable discount 62 (1,099) 616
Balance at end of period 560 885 3,682
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 18,834
Change in actual and expected losses (277) 65 (98)
Transfer (to) from accretable yield (62) 1,099 (616)
Balance at end of period $ 18,945 $ 19,284 $ 18,120