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Held to Maturity Debt Securities - Held to Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost | $ 451,043 |  | $ 453,629
Gross unrealized gains | 21,551 |  | 14,467
Gross unrealized losses | (65) |  | (130)
Allowance for credit losses | (78) | $ 70 | 0
Fair value | 472,451 |  | 467,966
Investment securities held to maturity | 450,965 |  | 453,629
Agency obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost | 7,600 |  | 6,599
Gross unrealized gains | 6 |  | 11
Gross unrealized losses | (5) |  | (9)
Allowance for credit losses | 0 |  | 0
Fair value | 7,601 |  | 6,601
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost | 62 |  | 118
Gross unrealized gains | 2 |  | 4
Gross unrealized losses | 0 |  | 0
Allowance for credit losses | 0 |  | 0
Fair value | 64 |  | 122
Investment securities held to maturity | 62 |  |
State and municipal obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost | 433,655 |  | 437,074
Gross unrealized gains | 21,442 |  | 14,394
Gross unrealized losses | (58) |  | (115)
Allowance for credit losses | (66) |  | 0
Fair value | 454,973 |  | 451,353
Corporate obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost | 9,726 |  | 9,838
Gross unrealized gains | 101 |  | 58
Gross unrealized losses | (2) |  | (6)
Allowance for credit losses | (12) |  | 0
Fair value | $ 9,813 |  | $ 9,890

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- Definition Debt Securities, Held-To-Maturity, Net Of Allowance For Credit Losses + References No definition available. + Details
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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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