XML 78 R60.htm IDEA: XBRL DOCUMENT v3.20.4
Investment Securities (Summary Of Investment Securities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost $ 5,568,188 $ 5,293,918
Unrealized Gains 269,717 103,156
Unrealized Losses (2,541) (16,421)
Fair Value 5,835,364 5,380,653
Debt Securities, Held-to-maturity, Allowance for Credit Loss 299 0
Debt Securities, Held-to-maturity, Current 5,567,889 5,293,918
Interest Receivable 57,800 59,000
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 3,234,250 2,901,415
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 101,997 38,270
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 9,471 13,852
Investment securities available-for-sale, at fair value 3,326,776 2,925,833
Held-to-maturity Securities [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Interest Receivable 22,100 21,800
Available-for-sale Securities    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Interest Receivable 7,500 8,100
Collateralized Mortgage Obligations [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 91,622 167,443
Unrealized Gains 1,785 1,123
Unrealized Losses (241) (1,200)
Fair Value 93,166 167,366
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Debt Securities, Held-to-maturity, Current 91,622 167,443
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 148,711 184,500
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,000 2,218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 98 917
Investment securities available-for-sale, at fair value 154,613 185,801
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 2,419,751 2,957,900
Unrealized Gains 137,863 60,602
Unrealized Losses (84) (8,733)
Fair Value 2,557,530 3,009,769
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Debt Securities, Held-to-maturity, Current 2,419,751 2,957,900
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 1,389,100 1,580,743
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 68,598 35,456
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 289 4,035
Investment securities available-for-sale, at fair value 1,457,409 1,612,164
Agency commercial mortgage-backed securities (agency CMBS) [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 2,101,227 1,172,491
Unrealized Gains 60,484 6,444
Unrealized Losses (2,213) (5,615)
Fair Value 2,159,498 1,173,320
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Debt Securities, Held-to-maturity, Current 2,101,227 1,172,491
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 1,092,430 587,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 26,317 513
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,514 6,935
Investment securities available-for-sale, at fair value 1,117,233 581,552
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 216,081 255,653
Unrealized Gains 9,214 2,278
Unrealized Losses 0 (852)
Fair Value 225,295 257,079
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Debt Securities, Held-to-maturity, Current 216,081 255,653
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 512,759 432,085
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,082 38
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 5,823 252
Investment securities available-for-sale, at fair value 508,018 431,871
Collateralized loan obligations (CLO) [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 76,693 92,628
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 45
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 310 468
Investment securities available-for-sale, at fair value 76,383 92,205
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 14,557 23,485
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,437 1,245
Investment securities available-for-sale, at fair value 13,120 22,240
Municipal Bonds [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 739,507 740,431
Unrealized Gains 60,371 32,709
Unrealized Losses (3) (21)
Fair Value 799,875 773,119
Debt Securities, Held-to-maturity, Allowance for Credit Loss 299 0
Debt Securities, Held-to-maturity, Current 739,208 $ 740,431
Callable [Member]    
Debt Securities, Available-for-sale [Abstract]    
Investment securities available-for-sale, at fair value $ 1,300,000