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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
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Balance at beginning of period $ 264,893 $ 296,465 $ 269,510 $ 308,913
Accretion (8,932) (11,362) (18,452) (23,245)
Change in expected cash flow 1,573 3,248 5,139 6,888
Transfer from (to) non-accretable discount (5,016) (359) (3,679) (4,564)
Balance at end of period 252,518 287,992 252,518 287,992
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 342,902 354,590 345,423 352,431
Change in actual and expected losses (1,863) (4,692) (3,047) (6,738)
Transfer (to) from accretable yield 5,016 359 3,679 4,564
Balance at end of period 346,055 350,257 346,055 350,257
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 226,907 248,379 232,199 258,498
Accretion (6,115) (6,915) (12,465) (13,988)
Change in expected cash flow 0 0 0 0
Transfer from (to) non-accretable discount (3,243) 2,439 (2,185) (607)
Balance at end of period 217,549 243,903 217,549 243,903
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 290,100 301,107 291,887 299,501
Change in actual and expected losses (1,085) (2,531) (1,814) (3,971)
Transfer (to) from accretable yield 3,243 (2,439) 2,185 607
Balance at end of period 292,258 296,137 292,258 296,137
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 37,379 45,711 36,508 46,764
Accretion (2,488) (3,597) (5,144) (7,282)
Change in expected cash flow 1,375 2,775 4,640 5,931
Transfer from (to) non-accretable discount (1,628) (2,368) (1,366) (2,892)
Balance at end of period 34,638 42,521 34,638 42,521
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 9,911 10,731 10,346 10,596
Change in actual and expected losses (635) (1,956) (808) (2,345)
Transfer (to) from accretable yield 1,628 2,368 1,366 2,892
Balance at end of period 10,904 11,143 10,904 11,143
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 180 1,726 243 2,766
Accretion (139) (656) (355) (1,525)
Change in expected cash flow 8 400 11 826
Transfer from (to) non-accretable discount (6) (399) 144 (996)
Balance at end of period 43 1,071 43 1,071
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 24,056 23,443 24,245 23,050
Change in actual and expected losses 21 (197) (18) (401)
Transfer (to) from accretable yield 6 399 (144) 996
Balance at end of period 24,083 23,645 24,083 23,645
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 427 649 560 885
Accretion (190) (194) (488) (450)
Change in expected cash flow 190 73 488 131
Transfer from (to) non-accretable discount (139) (31) (272) (69)
Balance at end of period 288 497 288 497
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]        
Balance at beginning of period 18,835 19,309 18,945 19,284
Change in actual and expected losses (164) (8) (407) (21)
Transfer (to) from accretable yield 139 31 272 69
Balance at end of period $ 18,810 $ 19,332 $ 18,810 $ 19,332