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Securities (Securities Available for Sale) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Proceeds from Sale of Debt Securities, Available-for-sale $ 0 $ 0 $ 259,554 $ 32,330  
Debt securities available-for-sale, amortized cost 3,300,143   3,300,143   $ 3,210,615
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 79,026   79,026   12,799
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (11,597)   (11,597)   (55,966)
Debt securities available for sale at fair value 3,367,572   3,367,572   3,167,448
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities available-for-sale, amortized cost [1] 2,432,873   2,432,873   2,045,728
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 61,024   61,024   8,473
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (11,062)   (11,062)   (40,846)
Debt securities available for sale at fair value [1] 2,482,835   2,482,835   2,013,355
Asset-backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities available-for-sale, amortized cost [1] 166,482   166,482   176,793
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 5,149   5,149   763
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (53)   (53)   (2,621)
Debt securities available for sale at fair value [1] 171,578   171,578   174,935
State and Municipal Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities available-for-sale, amortized cost 488,273   488,273   579,755
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9,471   9,471   2,328
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (430)   (430)   (7,760)
Debt securities available for sale at fair value 497,314   497,314   574,323
U.S. Government and Government-Sponsored Enterprise Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities available-for-sale, amortized cost 212,265   212,265   408,088
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,382   3,382   1,235
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (52)   (52)   (4,736)
Debt securities available for sale at fair value 215,595   215,595   404,587
US Government Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities available-for-sale, amortized cost 250   250   251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0   0   (3)
Debt securities available for sale at fair value $ 250   $ 250   $ 248
[1] Beginning July 2019, other asset-backed securities were presented separately in this table. Prior period amounts that were previously reported in U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations have been reclassified to conform to current period presentation.