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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Total securities, Less than 12 months, Estimated Fair Value $ 40,409 $ 120,181
Total securities, Less than 12 months, Unrealized Losses (103) (932)
Total securities, 12 months or longer, Estimated Fair Value 626,597 622,974
Total securities, 12 months or longer, Unrealized Losses (12,310) (20,427)
Total securities, Estimated Fair Value 667,006 743,155
Total securities, Unrealized Losses (12,413) (21,359)
Held-to-Maturity Securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 40,409 118,203
Held-to-maturity, Less than 12 months, Unrealized Losses (103) (924)
Held-to-maturity, 12 months or longer, Estimated Fair Value 563,197 556,536
Held-to-maturity, 12 months or longer, Unrealized Losses (11,678) (19,467)
Held-to-maturity, Total, Estimated Fair Value 603,606 674,739
Held-to-maturity, Total, Unrealized Losses (11,781) (20,391)
Held-to-Maturity Securities | Investment Securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 5,513 5,326
Held-to-maturity, Less than 12 months, Unrealized Losses (26) (25)
Held-to-maturity, 12 months or longer, Estimated Fair Value 138,758 163,977
Held-to-maturity, 12 months or longer, Unrealized Losses (4,182) (6,786)
Held-to-maturity, Total, Estimated Fair Value 144,271 169,303
Held-to-maturity, Total, Unrealized Losses (4,208) (6,811)
Investment securities - U.S. government and agency obligations | Held-to-Maturity Securities | Investment Securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 0 0
Held-to-maturity, Less than 12 months, Unrealized Losses 0 0
Held-to-maturity, 12 months or longer, Estimated Fair Value 14,900 14,845
Held-to-maturity, 12 months or longer, Unrealized Losses (78) (130)
Held-to-maturity, Total, Estimated Fair Value 14,900 14,845
Held-to-maturity, Total, Unrealized Losses (78) (130)
Mortgage-backed securities | Held-to-Maturity Securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 34,896 112,877
Held-to-maturity, Less than 12 months, Unrealized Losses (77) (899)
Held-to-maturity, 12 months or longer, Estimated Fair Value 424,439 392,559
Held-to-maturity, 12 months or longer, Unrealized Losses (7,496) (12,681)
Held-to-maturity, Total, Estimated Fair Value 459,335 505,436
Held-to-maturity, Total, Unrealized Losses (7,573) (13,580)
Mortgage-backed securities | Held-to-Maturity Securities | FHLMC    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 1,902 46,615
Held-to-maturity, Less than 12 months, Unrealized Losses (16) (159)
Held-to-maturity, 12 months or longer, Estimated Fair Value 156,294 147,763
Held-to-maturity, 12 months or longer, Unrealized Losses (2,722) (4,951)
Held-to-maturity, Total, Estimated Fair Value 158,196 194,378
Held-to-maturity, Total, Unrealized Losses (2,738) (5,110)
Mortgage-backed securities | Held-to-Maturity Securities | FNMA    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 15,571 27,594
Held-to-maturity, Less than 12 months, Unrealized Losses (36) (125)
Held-to-maturity, 12 months or longer, Estimated Fair Value 187,853 185,328
Held-to-maturity, 12 months or longer, Unrealized Losses (2,927) (5,905)
Held-to-maturity, Total, Estimated Fair Value 203,424 212,922
Held-to-maturity, Total, Unrealized Losses (2,963) (6,030)
Mortgage-backed securities | Held-to-Maturity Securities | GNMA    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 17,423 35,221
Held-to-maturity, Less than 12 months, Unrealized Losses (25) (535)
Held-to-maturity, 12 months or longer, Estimated Fair Value 76,925 59,468
Held-to-maturity, 12 months or longer, Unrealized Losses (1,769) (1,825)
Held-to-maturity, Total, Estimated Fair Value 94,348 94,689
Held-to-maturity, Total, Unrealized Losses (1,794) (2,360)
Mortgage-backed securities | Held-to-Maturity Securities | SBA    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 0 3,447
Held-to-maturity, Less than 12 months, Unrealized Losses 0 (80)
Held-to-maturity, 12 months or longer, Estimated Fair Value 3,367 0
Held-to-maturity, 12 months or longer, Unrealized Losses (78) 0
Held-to-maturity, Total, Estimated Fair Value 3,367 3,447
Held-to-maturity, Total, Unrealized Losses (78) (80)
State and municipal obligations | Held-to-Maturity Securities | Investment Securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 3,987 2,856
Held-to-maturity, Less than 12 months, Unrealized Losses (7) (4)
Held-to-maturity, 12 months or longer, Estimated Fair Value 79,317 106,073
Held-to-maturity, 12 months or longer, Unrealized Losses (634) (1,693)
Held-to-maturity, Total, Estimated Fair Value 83,304 108,929
Held-to-maturity, Total, Unrealized Losses (641) (1,697)
Corporate debt securities | Held-to-Maturity Securities | Investment Securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 1,526 2,470
Held-to-maturity, Less than 12 months, Unrealized Losses (19) (21)
Held-to-maturity, 12 months or longer, Estimated Fair Value 44,541 43,059
Held-to-maturity, 12 months or longer, Unrealized Losses (3,470) (4,963)
Held-to-maturity, Total, Estimated Fair Value 46,067 45,529
Held-to-maturity, Total, Unrealized Losses (3,489) (4,984)
Investment Securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less thank 12 months, Estimated Fair Value 0 1,978
Available-for-sale, Less than 12 Months, Unrealized Losses 0 (8)
Available-for-sale, 12 months or longer, Estimated Fair Value 63,400 66,438
Available-for-sale, 12 months or longer, Unrealized Losses (632) (960)
Available-for-sale, Total, Estimated Fair Value 63,400 68,416
Available-for-sale, Total, Unrealized Losses (632) (968)
Investment Securities | Investment securities - U.S. government and agency obligations    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less thank 12 months, Estimated Fair Value 0 985
Available-for-sale, Less than 12 Months, Unrealized Losses 0 (3)
Available-for-sale, 12 months or longer, Estimated Fair Value 62,766 66,438
Available-for-sale, 12 months or longer, Unrealized Losses (630) (960)
Available-for-sale, Total, Estimated Fair Value 62,766 67,423
Available-for-sale, Total, Unrealized Losses (630) (963)
Investment Securities | Mortgage-backed securities | FNMA    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less thank 12 months, Estimated Fair Value 0 993
Available-for-sale, Less than 12 Months, Unrealized Losses 0 (5)
Available-for-sale, 12 months or longer, Estimated Fair Value 634 0
Available-for-sale, 12 months or longer, Unrealized Losses (2) 0
Available-for-sale, Total, Estimated Fair Value 634 993
Available-for-sale, Total, Unrealized Losses $ (2) $ (5)