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Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments Debt And Equity Securities [Abstract] |
Summary of Investment Securities Available for Sale | The following is a summary of securities available for sale as of December 31, 2020 and 2019:
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
|  | (in thousands) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 9,997 |  |  | $ | 135 |  |  | $ | — |  |  | $ | 10,132 |
U.S. government agency and sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  | 515,169 |  |  |  | 4,260 |  |  |  | (188 | ) |  |  | 519,241 |
Collateralized mortgage obligations |  |  | 133,632 |  |  |  | 186 |  |  |  | (217 | ) |  |  | 133,601 |
Debt securities |  |  | 90,660 |  |  |  | 148 |  |  |  | (1 | ) |  |  | 90,807 |
Total U.S. government agency and sponsored agency obligations |  |  | 739,461 |  |  |  | 4,594 |  |  |  | (406 | ) |  |  | 743,649 |
Total securities available for sale |  | $ | 749,458 |  |  | $ | 4,729 |  |  | $ | (406 | ) |  | $ | 753,781 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 34,946 |  |  | $ | 259 |  |  | $ | — |  |  | $ | 35,206 |
U.S. government agency and sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  | 406,813 |  |  |  | 4,334 |  |  |  | (347 | ) |  |  | 410,801 |
Collateralized mortgage obligations |  |  | 164,232 |  |  |  | 792 |  |  |  | (432 | ) |  |  | 164,592 |
Debt securities |  |  | 23,733 |  |  |  | 168 |  |  |  | (22 | ) |  |  | 23,878 |
Total U.S. government agency and sponsored agency obligations |  |  | 594,778 |  |  |  | 5,294 |  |  |  | (801 | ) |  |  | 599,271 |
Total securities available for sale |  | $ | 629,725 |  |  | $ | 5,553 |  |  | $ | (801 | ) |  | $ | 634,477 |
Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity | The amortized cost and estimated fair value of securities as of December 31, 2020, by contractual or expected maturity, are shown below. Collateralized mortgage obligations are included in the table shown below based on their expected maturities. All other securities are included based on their contractual maturities.
|  | Available for Sale |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
|  | (in thousands) |
Within one year |  | $ | 13,305 |  |  | $ | 13,435 |
Over one year through five years |  |  | 139,876 |  |  |  | 140,100 |
Over five years through ten years |  |  | 25,764 |  |  |  | 25,768 |
Over ten years |  |  | 570,513 |  |  |  | 574,478 |
Total |  | $ | 749,458 |  |  | $ | 753,781 |
Summary of Debt Securities Available for Sale in an Unrealized Loss Position for Which an Allowance for Credit Losses Has Not Been Recorded | The following table summarizes debt securities available-for-sale in an unrealized loss position for which an allowance for credit losses has not been recorded at December 31, 2020, aggregated by major security type and length of time in a continuous unrealized loss position:
|  | Holding Period |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Gross Unrealized Loss |  |  | Estimated Fair Value |  |  | Number of Securities |  |  | Gross Unrealized Loss |  |  | Estimated Fair Value |  |  | Number of Securities |  |  | Gross Unrealized Loss |  |  | Estimated Fair Value |  |  | Number of Securities |
|  | (in thousands, except number of securities) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency and sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | (188 | ) |  | $ | 76,023 |  |  |  | 10 |  |  | $ | — |  |  | $ | — |  |  |  | — |  |  | $ | (188 | ) |  | $ | 76,023 |  |  |  | 10 |
Collateralized mortgage obligations |  |  | (217 | ) |  |  | 97,659 |  |  |  | 21 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (217 | ) |  |  | 97,659 |  |  |  | 21 |
Debt securities |  |  | (1 | ) |  |  | 4,999 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | 4,999 |  |  |  | 1 |
Total U.S. government agency and sponsored agency obligations |  |  | (406 | ) |  |  | 178,681 |  |  |  | 32 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (406 | ) |  |  | 178,681 |  |  |  | 32 |
Total |  | $ | (406 | ) |  | $ | 178,681 |  |  |  | 32 |  |  | $ | — |  |  | $ | — |  |  |  | — |  |  | $ | (406 | ) |  | $ | 178,681 |  |  |  | 32 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency and sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | (186 | ) |  | $ | 51,261 |  |  |  | 17 |  |  | $ | (160 | ) |  | $ | 18,757 |  |  |  | 14 |  |  |  | (346 | ) |  |  | 70,018 |  |  |  | 31 |
Collateralized mortgage obligations |  |  | (112 | ) |  |  | 41,419 |  |  |  | 14 |  |  |  | (320 | ) |  |  | 39,936 |  |  |  | 36 |  |  |  | (432 | ) |  |  | 81,355 |  |  |  | 50 |
Debt securities |  |  | (20 | ) |  |  | 8,236 |  |  |  | 2 |  |  |  | (3 | ) |  |  | 2,997 |  |  |  | 1 |  |  |  | (23 | ) |  |  | 11,233 |  |  |  | 3 |
Total U.S. government agency and sponsored agency obligations |  |  | (318 | ) |  |  | 100,916 |  |  |  | 33 |  |  |  | (483 | ) |  |  | 61,690 |  |  |  | 51 |  |  |  | (801 | ) |  |  | 162,606 |  |  |  | 84 |
Total |  | $ | (318 | ) |  | $ | 100,916 |  |  |  | 33 |  |  | $ | (483 | ) |  | $ | 61,690 |  |  |  | 51 |  |  | $ | (801 | ) |  | $ | 162,606 |  |  |  | 84 |
Realized Gains and Losses on Sales of Investment Securities | Realized gains and losses on sales of securities and proceeds from sales of securities were as follows for the periods indicated:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
Gross realized gains on sales of securities |  | $ | 15,712 |  |  | $ | 1,359 |  |  | $ | 87 |
Gross realized losses on sales of securities |  |  | — |  |  |  | (64 | ) |  |  | (957 | )
Net realized gains (losses) on sales of securities |  | $ | 15,712 |  |  | $ | 1,295 |  |  | $ | (870 | )
Proceeds from sales of securities |  | $ | 495,566 |  |  |  | 113,306 |  |  |  | 34,751 |

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