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Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, fair value | $ 133,349 | $ 138,283 |
Less than 12 months, gross unrealized losses | (1,205) | (644) |
12 months or longer, fair value | 10,470 | 46,819 |
12 months or longer, gross unrealized losses | (73) | (504) |
Total, fair value | 143,819 | 185,102 |
Total, gross unrealized losses | (1,278) | (1,148) |
Agency Obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, fair value |  |  | $ 478
Less than 12 months, gross unrealized losses |  |  | (1)
12 months or longer, fair value |  |  | 0
12 months or longer, gross unrealized losses |  |  | 0
Total, fair value |  |  | 478
Total, gross unrealized losses |  |  | $ (1)
Mortgage-Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, fair value | 84,276 | 136,270 |
Less than 12 months, gross unrealized losses | (835) | (629) |
12 months or longer, fair value | 8,489 | 46,819 |
12 months or longer, gross unrealized losses | (29) | (504) |
Total, fair value | 92,765 | 183,089 |
Total, gross unrealized losses | (864) | (1,133) |
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, fair value | 7,624 |  |
Less than 12 months, gross unrealized losses | (27) |  |
12 months or longer, fair value | 0 |  |
12 months or longer, gross unrealized losses | 0 |  |
Total, fair value | 7,624 |  |
Total, gross unrealized losses | (27) |  |
State And Municipal Obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, fair value | 34,033 |  |
Less than 12 months, gross unrealized losses | (331) |  |
12 months or longer, fair value | 0 |  |
12 months or longer, gross unrealized losses | 0 |  |
Total, fair value | 34,033 |  |
Total, gross unrealized losses | (331) |  |
Corporate Obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, fair value | 6,938 | 2,013 |
Less than 12 months, gross unrealized losses | (11) | (15) |
12 months or longer, fair value | 1,981 | 0 |
12 months or longer, gross unrealized losses | (44) | 0 |
Total, fair value | 8,919 | 2,013 |
Total, gross unrealized losses | $ (55) | $ (15) |

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