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Investment in Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investment Securities | The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:
| June 30, 2022
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
State and political subdivisions | $ | 338,618 |  |  | $ | 1,125 |  |  | $ | 18,358 |  |  | $ | 321,385 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 205,229 |  |  | 4 |  |  | 21,725 |  |  | 183,508 |
Corporate bonds | 96,460 |  |  | — |  |  | 9,686 |  |  | 86,774 |
U.S. treasury bonds | 99,516 |  |  | — |  |  | 954 |  |  | 98,562 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 52,104 |  |  | — |  |  | 2,259 |  |  | 49,845 |
Total | $ | 791,927 |  |  | $ | 1,129 |  |  | $ | 52,982 |  |  | $ | 740,074 |
| December 31, 2021
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
State and political subdivisions | $ | 359,187 |  |  | $ | 12,931 |  |  | $ | 990 |  |  | $ | 371,128 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 170,711 |  |  | 135 |  |  | 2,200 |  |  | 168,646 |
Corporate bonds | 84,538 |  |  | 72 |  |  | 272 |  |  | 84,338 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 49,835 |  |  | — |  |  | 494 |  |  | 49,341 |
Total | $ | 664,271 |  |  | $ | 13,138 |  |  | $ | 3,956 |  |  | $ | 673,453 |
Schedule of Unrealized Loss on Investments | The fair values of securities with unrealized losses are as follows:
| June 30, 2022
| Less than 12 months |  | 12 months or more |  | Total
(In thousands) | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
State and political subdivisions | $ | 177,339 |  |  | $ | 18,358 |  |  | $ | — |  |  | $ | — |  |  | $ | 177,339 |  |  | $ | 18,358 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 163,657 |  |  | 19,123 |  |  | 15,095 |  |  | 2,602 |  |  | 178,752 |  |  | 21,725 |
Corporate bonds | 81,774 |  |  | 9,686 |  |  | — |  |  | — |  |  | 81,774 |  |  | 9,686 |
U.S. treasury bonds | 98,562 |  |  | 954 |  |  | — |  |  | — |  |  | 98,562 |  |  | 954 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 49,845 |  |  | 2,259 |  |  | — |  |  | — |  |  | 49,845 |  |  | 2,259 |
Total | $ | 571,177 |  |  | $ | 50,380 |  |  | $ | 15,095 |  |  | $ | 2,602 |  |  | $ | 586,272 |  |  | $ | 52,982 |
| December 31, 2021
| Less than 12 months |  | 12 months or more |  | Total
(In thousands) | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
State and political subdivisions | $ | 60,083 |  |  | $ | 990 |  |  | $ | — |  |  | $ | — |  |  | $ | 60,083 |  |  | $ | 990 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 163,652 |  |  | 2,200 |  |  | — |  |  | — |  |  | 163,652 |  |  | 2,200 |
Corporate bonds | 55,120 |  |  | 272 |  |  | — |  |  | — |  |  | 55,120 |  |  | 272 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 49,341 |  |  | 494 |  |  | — |  |  | — |  |  | 49,341 |  |  | 494 |
Total | $ | 328,196 |  |  | $ | 3,956 |  |  | $ | — |  |  | $ | — |  |  | $ | 328,196 |  |  | $ | 3,956 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The amortized cost and fair value of investment securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.
| June 30, 2022
(In thousands) | Amortized Cost |  | Fair Value
Due in 1 year or less | $ | 17,426 |  |  | $ | 17,524 |
Due after 1 year through 5 years | 242,236 |  |  | 240,649 |
Due after 5 years through 10 years | 233,362 |  |  | 218,004 |
Due after 10 years | 298,903 |  |  | 263,897 |
Total | $ | 791,927 |  |  | $ | 740,074 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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