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Investment Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 4,017,909 $ 3,721,525
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 31,812 68,965
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (40,290) (16,059)
Securities available-for-sale, at fair value 4,009,431 3,774,431
Government agency and government-sponsored enterprise pass through securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 281,486 243,375
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,902 3,743
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2,300) (844)
Securities available-for-sale, at fair value 281,088 246,274
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 634,774 277,638
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3,448 968
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (5,372) (2,897)
Securities available-for-sale, at fair value 632,850 275,709
Private Label Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 101,313 122,816
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,985 3,813
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2,093) (642)
Securities available-for-sale, at fair value 101,205 125,987
Municipal Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 1,298,514 1,627,707
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 21,000 53,700
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (7,320) (1,339)
Securities available-for-sale, at fair value 1,312,194 1,680,068
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 1,133,846 1,169,969
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 383 2,758
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (21,525) (8,758)
Securities available-for-sale, at fair value 1,112,704 1,163,969
US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 401,056 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2,437 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (88) 0
Securities available-for-sale, at fair value 403,405 0
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 17,000 17,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 553 2,295
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Securities available-for-sale, at fair value 17,553 19,295
Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 0 6,960
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 55
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Securities available-for-sale, at fair value 0 7,015
SBA asset-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 68,158 160,214
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 695
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1,111) (575)
Securities available-for-sale, at fair value 67,047 160,334
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 81,762 89,425
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 104 159
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (481) (874)
Securities available-for-sale, at fair value 81,385 88,710
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis [1] 0 6,421
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax [1] 0 779
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax [1] 0 (130)
Securities available-for-sale, at fair value [1] 0 $ 7,070 [2]
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 7,100  
[1] In connection with our adoption of ASU 2016-01 and ASU 2018-03 on January 1, 2018, we reclassified $7.1 million of equity investments from securities available-for-sale to other assets in the first quarter of 2018. The reclassification was applied prospectively without prior period amounts being restated.
[2] In connection with our adoption of ASU 2016-01 and ASU 2018-03 on January 1, 2018, we reclassified $7.1 million of equity investments from securities available-for-sale to other assets in the first quarter of 2018. The reclassification was applied prospectively without prior period amounts being restated.