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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value $ 6,951,942 $ 6,150,975
Liabilities at fair value 27,076 61,562
Derivative Financial Instruments, Liabilities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liabilities at fair value 27,076 61,562
US Treasury Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 24,957 5,005
U.S. Government agency and sponsored enterprise residential MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 2,348,687 1,527,242
U.S. Government agency and sponsored enterprise commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 139,220 124,586
Private label residential mortgage-backed securities and CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 527,858 375,098
Private label commercial mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 1,153,601 1,187,624
Single family rental real estate-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 572,948 861,251
Collateralized loan obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 700,319 487,296
Non-mortgage asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 82,637 186,736
Preferred stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 70,716 88,203
State and municipal obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 677,015 698,546
SBA securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 586,675 523,906
Other debt securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 8,839 8,091
Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 30,136 27,159
Derivative Financial Instruments, Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 28,334 50,232
Fair Value, Inputs, Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 94,995 91,895
Fair Value, Inputs, Level 1 | US Treasury Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 24,957 5,005
Fair Value, Inputs, Level 1 | Preferred stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 70,038 86,890
Fair Value, Inputs, Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 6,760,990 5,906,739
Liabilities at fair value 27,076 61,562
Fair Value, Inputs, Level 2 | Derivative Financial Instruments, Liabilities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liabilities at fair value 27,076 61,562
Fair Value, Inputs, Level 2 | U.S. Government agency and sponsored enterprise residential MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 2,348,687 1,527,242
Fair Value, Inputs, Level 2 | U.S. Government agency and sponsored enterprise commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 139,220 124,586
Fair Value, Inputs, Level 2 | Private label residential mortgage-backed securities and CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 467,061 254,488
Fair Value, Inputs, Level 2 | Private label commercial mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 1,153,601 1,187,624
Fair Value, Inputs, Level 2 | Single family rental real estate-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 572,948 861,251
Fair Value, Inputs, Level 2 | Collateralized loan obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 700,319 487,296
Fair Value, Inputs, Level 2 | Non-mortgage asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 82,637 186,736
Fair Value, Inputs, Level 2 | Preferred stocks    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 678 1,313
Fair Value, Inputs, Level 2 | State and municipal obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 677,015 698,546
Fair Value, Inputs, Level 2 | SBA securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 586,675 523,906
Fair Value, Inputs, Level 2 | Other debt securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 3,815 3,519
Fair Value, Inputs, Level 2 | Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 0 0
Fair Value, Inputs, Level 2 | Derivative Financial Instruments, Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 28,334 50,232
Fair Value, Inputs, Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 95,957 152,341
Liabilities at fair value 0 0
Fair Value, Inputs, Level 3 | Derivative Financial Instruments, Liabilities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liabilities at fair value 0 0
Fair Value, Inputs, Level 3 | Private label residential mortgage-backed securities and CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 60,797 120,610
Fair Value, Inputs, Level 3 | Other debt securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 5,024 4,572
Fair Value, Inputs, Level 3 | Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value 30,136 27,159
Fair Value, Inputs, Level 3 | Derivative Financial Instruments, Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, fair value $ 0 $ 0