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Investment Securities (Summary Of Investment Securities) (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost $ 2,901,415,000 $ 2,994,616,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 38,270,000 2,783,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 13,852,000 98,669,000
Investment securities available-for-sale, at fair value 2,925,833,000 2,898,730,000
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 5,293,918,000 4,325,420,000
Unrealized Gains 103,156,000 11,902,000
Unrealized Losses (16,421,000) (128,201,000)
Fair Value 5,380,653,000 4,209,121,000
US Treasury Bill Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 0 7,549,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 1,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Investment securities available-for-sale, at fair value 0 7,550,000
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 184,500,000 238,968,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,218,000 412,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 917,000 4,457,000
Investment securities available-for-sale, at fair value 185,801,000 234,923,000
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 167,443,000 208,113,000
Unrealized Gains 1,123,000 287,000
Unrealized Losses (1,200,000) (5,255,000)
Fair Value 167,366,000 203,145,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 1,580,743,000 1,521,534,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 35,456,000 1,631,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 4,035,000 42,076,000
Investment securities available-for-sale, at fair value 1,612,164,000 1,481,089,000
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 2,957,900,000 2,517,823,000
Unrealized Gains 60,602,000 8,250,000
Unrealized Losses (8,733,000) (79,701,000)
Fair Value 3,009,769,000 2,446,372,000
Agency commercial mortgage-backed securities (agency CMBS) [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 587,974,000 608,167,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 513,000 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 6,935,000 41,930,000
Investment securities available-for-sale, at fair value 581,552,000 566,237,000
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 1,172,491,000 667,500,000
Unrealized Gains 6,444,000 53,000
Unrealized Losses (5,615,000) (22,572,000)
Fair Value 1,173,320,000 644,981,000
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 432,085,000 447,897,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 38,000 645,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 252,000 2,961,000
Investment securities available-for-sale, at fair value 431,871,000 445,581,000
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 255,653,000 216,943,000
Unrealized Gains 2,278,000 405,000
Unrealized Losses (852,000) (2,388,000)
Fair Value 257,079,000 214,960,000
Collateralized loan obligations (CLO) [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 92,628,000 114,641,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 45,000 94,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 468,000 1,964,000
Investment securities available-for-sale, at fair value 92,205,000 112,771,000
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Debt Securities, Available-for-sale, Amortized Cost 23,485,000 55,860,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,245,000 5,281,000
Investment securities available-for-sale, at fair value 22,240,000 50,579,000
Municipal Bonds [Member]    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 740,431,000 715,041,000
Unrealized Gains 32,709,000 2,907,000
Unrealized Losses (21,000) (18,285,000)
Fair Value $ 773,119,000 $ 699,663,000