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Investment Securities (Narrative) (Detail) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) security position | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) security position | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) security position | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Available for sale debt securities, at fair value | $ 1,100,391,000 |  | $ 1,100,391,000 |  |  |  | $ 976,919,000 |  |
Securities held to maturity, at fair value | $ 446,591,000 |  | $ 446,591,000 |  |  |  | $ 453,629,000 |  |
Total number of all held to maturity and available for sale securities in an unrealized loss position | security | 68 |  | 68 |  |  |  | 85 |  |
Allowance for credit losses | $ (76,000) |  | $ (76,000) |  |  | $ 70,000 | $ 0 |  |
Retained earnings | 694,240,000 |  | 694,240,000 |  |  |  | 695,273,000 |  |
Securities available for sale, amortized cost | $ 1,067,874,000 |  | 1,067,874,000 |  |  |  | $ 965,135,000 |  |
Proceeds from sales of securities |  |  | $ 13,905,000 | $ 0 |  |  |  |  |
Securities available for sale, number of securities in an unrealized loss position | position | 55 |  | 55 |  |  |  | 50 |  |
Unrealized loss | $ 1,278,000 |  | $ 1,278,000 |  |  |  | $ 1,148,000 |  |
Held to maturity securities, proceeds from calls | 13,700,000 | $ 14,400,000 | 39,500,000 | 26,600,000 |  |  |  |  |
Held to maturity securities, recognized gain on calls | 0 | 0 | 55,000 | 0 |  |  |  |  |
Held to maturity securities, recognized loss on calls | 0 |  |  |  |  |  |  |  |
Investment securities held to maturity, fair value | 467,693,000 |  | 467,693,000 |  |  |  | 467,966,000 |  |
Allowance for credit losses | $ 106,314,000 | $ 57,344,000 | $ 106,314,000 | $ 57,344,000 | $ 86,259,000 | 55,525,000 | $ 55,525,000 | $ 62,810,000 | $ 55,562,000
Number of securities in an unrealized loss position | security | 13 |  | 13 |  |  |  | 35 |  |
AAA |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Securities held to maturity, at fair value | $ 59,303,000 |  | $ 59,303,000 |  |  |  | $ 56,033,000 |  |
Amount of total portfolio |  |  | 13.00% |  |  |  |  |  |
AA |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Securities held to maturity, at fair value | 315,772,000 |  | $ 315,772,000 |  |  |  | 333,450,000 |  |
Amount of total portfolio |  |  | 71.00% |  |  |  |  |  |
A |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Securities held to maturity, at fair value | 60,033,000 |  | $ 60,033,000 |  |  |  | 62,652,000 |  |
Amount of total portfolio |  |  | 13.00% |  |  |  |  |  |
A rated or not rated |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Amount of total portfolio |  |  | 2.00% |  |  |  |  |  |
Private Label Mortgage-Backed Securities |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Securities available for sale, amortized cost | $ 17,000,000 |  | $ 17,000,000 |  |  |  |  |  |
Securities available for sale, number of securities in an unrealized loss position | position | 1 |  | 1 |  |  |  |  |  |
Unrealized loss | $ 2,000,000 |  | $ 2,000,000 |  |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  |  |  |  | 70,000 |  |  |
Allowance for credit losses |  |  |  |  |  | 7,900,000 |  |  |
Accounting Standards Update 2016-13, Effect On Debt Securities |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 52,000 |  |  |
Mortgage-Backed Securities |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Available for sale debt securities, at fair value | 934,171,000 |  | 934,171,000 |  |  |  | 947,430,000 |  |
Allowance for credit losses | 0 |  | 0 |  |  |  | 0 |  |
Securities available for sale, amortized cost | 903,628,000 |  | 903,628,000 |  |  |  | 936,196,000 |  |
Unrealized loss | 864,000 |  | 864,000 |  |  |  | 1,133,000 |  |
Held-to-maturity securities, amortized cost | 75,000 |  | 75,000 |  |  |  |  |  |
Investment securities held to maturity, fair value | 77,000 |  | 77,000 |  |  |  | 122,000 |  |
Allowance for credit losses | 76,000 |  | 76,000 |  |  |  |  |  |
Mortgage-Backed Securities | AAA |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Securities held to maturity, at fair value | 75,000 |  | 75,000 |  |  |  | 118,000 |  |
Mortgage-Backed Securities | AA |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Securities held to maturity, at fair value | 0 |  | 0 |  |  |  | 0 |  |
Mortgage-Backed Securities | A |  |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |
Securities held to maturity, at fair value | $ 0 |  | $ 0 |  |  |  | $ 0 |  |

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