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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Amortized cost and estimated fair value of available for sale securities | The following tables set forth certain information regarding the amortized cost basis and fair values of our investment securities AFS and HTM:
| At December 31, 2023
(in thousands) | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
AFS |  |  |  |  |  |  |
Mortgage-backed securities ("MBS"): |  |  |  |  |  |  |
Residential | $ | 194,141 |  |  | $ | 117 |  |  | $ | (10,460) |  |  | $ | 183,798 |
Commercial | 55,235 |  |  | — |  |  | (7,479) |  |  | 47,756 |
Collateralized mortgage obligations ("CMOs") |  |  |  |  |  |  |
Residential | 473,269 |  |  | 8 |  |  | (33,539) |  |  | 439,738 |
Commercial | 63,456 |  |  | — |  |  | (6,059) |  |  | 57,397 |
Municipal bonds | 452,057 |  |  | 670 |  |  | (47,853) |  |  | 404,874 |
Corporate debt securities | 45,611 |  |  | 34 |  |  | (7,098) |  |  | 38,547 |
U.S. Treasury securities | 22,658 |  |  | — |  |  | (2,474) |  |  | 20,184 |
Agency debentures | 60,202 |  |  | 5 |  |  | (1,302) |  |  | 58,905 |
Total | $ | 1,366,629 |  |  | $ | 834 |  |  | $ | (116,264) |  |  | $ | 1,251,199 |
HTM |  |  |  |  |  |  |
Municipal bonds | $ | 2,371 |  |  | $ | — |  |  | $ | (40) |  |  | $ | 2,331 |
| At December 31, 2022
(in thousands) | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
AFS |  |  |  |  |  |  |
MBS: |  |  |  |  |  |  |
Residential | $ | 207,445 |  |  | $ | — |  |  | $ | (10,183) |  |  | $ | 197,262 |
Commercial | 65,411 |  |  | — |  |  | (9,362) |  |  | 56,049 |
CMOs: |  |  |  |  |  |  |
Residential | 592,449 |  |  | 12 |  |  | (39,422) |  |  | 553,039 |
Commercial | 77,909 |  |  | — |  |  | (7,390) |  |  | 70,519 |
Municipal bonds | 469,346 |  |  | 41 |  |  | (57,839) |  |  | 411,548 |
Corporate debt securities | 46,672 |  |  | 74 |  |  | (3,801) |  |  | 42,945 |
U.S. Treasury securities | 23,005 |  |  | — |  |  | (3,071) |  |  | 19,934 |
Agency debentures | 27,499 |  |  | 8 |  |  | (29) |  |  | 27,478 |
Total | $ | 1,509,736 |  |  | $ | 135 |  |  | $ | (131,097) |  |  | $ | 1,378,774 |
HTM |  |  |  |  |  |  |
Municipal bonds | $ | 2,441 |  |  | $ | — |  |  | $ | (56) |  |  | $ | 2,385 |
Amortized cost and estimated fair value of held to maturity securities | The following tables set forth certain information regarding the amortized cost basis and fair values of our investment securities AFS and HTM:
| At December 31, 2023
(in thousands) | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
AFS |  |  |  |  |  |  |
Mortgage-backed securities ("MBS"): |  |  |  |  |  |  |
Residential | $ | 194,141 |  |  | $ | 117 |  |  | $ | (10,460) |  |  | $ | 183,798 |
Commercial | 55,235 |  |  | — |  |  | (7,479) |  |  | 47,756 |
Collateralized mortgage obligations ("CMOs") |  |  |  |  |  |  |
Residential | 473,269 |  |  | 8 |  |  | (33,539) |  |  | 439,738 |
Commercial | 63,456 |  |  | — |  |  | (6,059) |  |  | 57,397 |
Municipal bonds | 452,057 |  |  | 670 |  |  | (47,853) |  |  | 404,874 |
Corporate debt securities | 45,611 |  |  | 34 |  |  | (7,098) |  |  | 38,547 |
U.S. Treasury securities | 22,658 |  |  | — |  |  | (2,474) |  |  | 20,184 |
Agency debentures | 60,202 |  |  | 5 |  |  | (1,302) |  |  | 58,905 |
Total | $ | 1,366,629 |  |  | $ | 834 |  |  | $ | (116,264) |  |  | $ | 1,251,199 |
HTM |  |  |  |  |  |  |
Municipal bonds | $ | 2,371 |  |  | $ | — |  |  | $ | (40) |  |  | $ | 2,331 |
| At December 31, 2022
(in thousands) | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
AFS |  |  |  |  |  |  |
MBS: |  |  |  |  |  |  |
Residential | $ | 207,445 |  |  | $ | — |  |  | $ | (10,183) |  |  | $ | 197,262 |
Commercial | 65,411 |  |  | — |  |  | (9,362) |  |  | 56,049 |
CMOs: |  |  |  |  |  |  |
Residential | 592,449 |  |  | 12 |  |  | (39,422) |  |  | 553,039 |
Commercial | 77,909 |  |  | — |  |  | (7,390) |  |  | 70,519 |
Municipal bonds | 469,346 |  |  | 41 |  |  | (57,839) |  |  | 411,548 |
Corporate debt securities | 46,672 |  |  | 74 |  |  | (3,801) |  |  | 42,945 |
U.S. Treasury securities | 23,005 |  |  | — |  |  | (3,071) |  |  | 19,934 |
Agency debentures | 27,499 |  |  | 8 |  |  | (29) |  |  | 27,478 |
Total | $ | 1,509,736 |  |  | $ | 135 |  |  | $ | (131,097) |  |  | $ | 1,378,774 |
HTM |  |  |  |  |  |  |
Municipal bonds | $ | 2,441 |  |  | $ | — |  |  | $ | (56) |  |  | $ | 2,385 |
Investment securities in an unrealized loss position | Investment securities AFS that were in an unrealized loss position are presented in the following tables based on the length of time the individual securities have been in an unrealized loss position:
| At December 31, 2023
| Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value
AFS |  |  |  |  |  |  |  |  |  |  |
MBS: |  |  |  |  |  |  |  |  |  |  |
Residential | $ | (3) |  |  | $ | 1,145 |  |  | $ | (10,457) |  |  | $ | 177,393 |  |  | $ | (10,460) |  |  | $ | 178,538 |
Commercial | — |  |  | 61 |  |  | (7,479) |  |  | 47,695 |  |  | (7,479) |  |  | 47,756 |
CMOs: |  |  |  |  |  |  |  |  |  |  |
Residential | (368) |  |  | 83,815 |  |  | (33,171) |  |  | 348,914 |  |  | (33,539) |  |  | 432,729 |
Commercial | — |  |  | — |  |  | (6,059) |  |  | 57,397 |  |  | (6,059) |  |  | 57,397 |
Municipal bonds | (73) |  |  | 7,489 |  |  | (47,780) |  |  | 364,775 |  |  | (47,853) |  |  | 372,264 |
Corporate debt securities | — |  |  | — |  |  | (7,098) |  |  | 28,513 |  |  | (7,098) |  |  | 28,513 |
U.S. Treasury securities | — |  |  | — |  |  | (2,474) |  |  | 20,184 |  |  | (2,474) |  |  | 20,184 |
Agency debentures | (135) |  |  | 42,897 |  |  | (1,167) |  |  | 11,003 |  |  | (1,302) |  |  | 53,900 |
Total | $ | (579) |  |  | $ | 135,407 |  |  | $ | (115,685) |  |  | $ | 1,055,874 |  |  | $ | (116,264) |  |  | $ | 1,191,281 |
HTM |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | $ | — |  |  | $ | — |  |  | $ | (40) |  |  | $ | 2,331 |  |  | $ | (40) |  |  | $ | 2,331 |
| At December 31, 2022
| Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value
AFS |  |  |  |  |  |  |  |  |  |  |
MBS: |  |  |  |  |  |  |  |  |  |  |
Residential | $ | (8,845) |  |  | $ | 191,398 |  |  | $ | (1,338) |  |  | $ | 5,763 |  |  | $ | (10,183) |  |  | $ | 197,161 |
Commercial | (5,729) |  |  | 41,416 |  |  | (3,633) |  |  | 14,619 |  |  | (9,362) |  |  | 56,035 |
CMOs: |  |  |  |  |  |  |  |  |  |  |
Residential | (27,789) |  |  | 498,333 |  |  | (11,633) |  |  | 45,689 |  |  | (39,422) |  |  | 544,022 |
Commercial | (4,787) |  |  | 56,671 |  |  | (2,603) |  |  | 13,848 |  |  | (7,390) |  |  | 70,519 |
Municipal bonds | (44,513) |  |  | 350,918 |  |  | (13,326) |  |  | 46,377 |  |  | (57,839) |  |  | 397,295 |
Corporate debt securities | (3,801) |  |  | 32,871 |  |  | — |  |  | — |  |  | (3,801) |  |  | 32,871 |
U.S. Treasury securities | — |  |  | — |  |  | (3,071) |  |  | 19,934 |  |  | (3,071) |  |  | 19,934 |
Agency debentures | (29) |  |  | 15,970 |  |  | — |  |  | — |  |  | (29) |  |  | 15,970 |
Total | $ | (95,493) |  |  | $ | 1,187,577 |  |  | $ | (35,604) |  |  | $ | 146,230 |  |  | $ | (131,097) |  |  | $ | 1,333,807 |
HTM |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | $ | (56) |  |  | $ | 2,385 |  |  | $ | — |  |  | $ | — |  |  | $ | (56) |  |  | $ | 2,385 |
Amortized cost and estimated fair value by contractual maturity | The following tables present the fair value of investment securities AFS and HTM by contractual maturity along with the associated contractual yield.
| At December 31, 2023
| Within one year |  | After one year through five years |  | After five years through ten years |  | After ten years |  | Total
(dollars in thousands) | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield
AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | $ | — |  |  | — | % |  | $ | 5,856 |  |  | 1.84 | % |  | $ | 60,775 |  |  | 3.36 | % |  | $ | 338,243 |  |  | 3.01 | % |  | $ | 404,874 |  |  | 3.04 | %
Corporate debt securities | 4,425 |  |  | 3.53 | % |  | 12,714 |  |  | 4.95 | % |  | 21,408 |  |  | 3.89 | % |  | — |  |  | — | % |  | 38,547 |  |  | 4.21 | %
U.S. Treasury securities | — |  |  | — | % |  | 20,184 |  |  | 1.14 | % |  | — |  |  | — | % |  | — |  |  | — | % |  | 20,184 |  |  | 1.14 | %
Agency debentures | 16,977 |  |  | 4.93 | % |  | 30,925 |  |  | 5.20 | % |  | 7,758 |  |  | 2.15 | % |  | 3,245 |  |  | 2.17 | % |  | 58,905 |  |  | 4.51 | %
Total | $ | 21,402 |  |  | 4.64 | % |  | $ | 69,679 |  |  | 3.64 | % |  | $ | 89,941 |  |  | 3.40 | % |  | $ | 341,488 |  |  | 3.00 | % |  | $ | 522,510 |  |  | 3.21 | %
HTM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | $ | — |  |  | — | % |  | $ | 2,331 |  |  | 2.29 | % |  | $ | — |  |  | — | % |  | $ | — |  |  | — | % |  | $ | 2,331 |  |  | 2.29 | %
| At December 31, 2022
| Within one year |  | After one year through five years |  | After five years through ten years |  | After ten years |  | Total
(dollars in thousands) | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield |  | Fair Value |  | Weighted Average Yield
AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | $ | — |  |  | — | % |  | $ | 3,644 |  |  | 1.96 | % |  | $ | 38,977 |  |  | 3.04 | % |  | $ | 368,927 |  |  | 2.83 | % |  | $ | 411,548 |  |  | 2.84 | %
Corporate debt securities | — |  |  | — | % |  | 15,342 |  |  | 5.13 | % |  | 27,603 |  |  | 4.25 | % |  | — |  |  | — | % |  | 42,945 |  |  | 4.54 | %
U.S. Treasury securities | — |  |  | — | % |  | — |  |  | — | % |  | 19,934 |  |  | 1.11 | % |  | — |  |  | — | % |  | 19,934 |  |  | 1.11 | %
Agency debentures | 10,485 |  |  | 4.74 | % |  | 16,993 |  |  | 4.94 | % |  | — |  |  | — | % |  | — |  |  | — | % |  | 27,478 |  |  | 4.86 | %
Total | $ | 10,485 |  |  | 4.74 | % |  | $ | 35,979 |  |  | 4.69 | % |  | $ | 86,514 |  |  | 2.97 | % |  | $ | 368,927 |  |  | 2.83 | % |  | $ | 501,905 |  |  | 3.01 | %
HTM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds | $ | — |  |  | — | % |  | $ | 2,385 |  |  | 2.04 | % |  | $ | — |  |  | — | % |  | $ | — |  |  | — | % |  | $ | 2,385 |  |  | 2.04 | %
Sales of investment securities available for sale | Sales of AFS investment securities were as follows:
| Years Ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Proceeds | $ | 4,693 |  |  | $ | 98,915 |  |  | $ | 28,187 |
Gross gains | 3 |  |  | 1,585 |  |  | 288 |
Gross losses | — |  |  | (1,561) |  |  | (226) |
Schedule of financial instruments owned and pledged as collateral | The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law.
| At December 31,
(in thousands) | 2023 |  | 2022
Federal Reserve Bank to secure borrowings | $ | 647,104 |  |  | $ | — |
Washington, Oregon and California State to secure public deposits | 10,654 |  |  | 212,806 |
Other securities pledged | 1,440 |  |  | 2,011 |
Total securities pledged as collateral | $ | 659,198 |  |  | $ | 214,817 |

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