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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Held-to-maturity Securities | Our investment securities portfolio consists of obligations of state and political subdivisions, corporate bonds, U.S. government agency securities, including residential and commercial mortgage-backed securities (“MBS”) and collateralized mortgage obligations (“CMOs”) issued or guaranteed by Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), or Government National Mortgage Association ("GNMA"), debentures issued by government-sponsored agencies such as FNMA, Federal Farm Credit Bureau, FHLB and FHLMC, as well as privately issued CMOs, as reflected in the following table:
| March 31, 2018 |  | December 31, 2017
| Amortized | Fair | Gross Unrealized |  | Amortized | Fair | Gross Unrealized
(in thousands) | Cost | Value | Gains | (Losses) |  | Cost | Value | Gains | (Losses)
Held-to-maturity: |  |  |  |  |  |  |  |  |
Obligations of state and political subdivisions | $ | 19,599 |  | $ | 19,857 |  | $ | 278 |  | $ | (20 | ) |  | $ | 19,646 |  | $ | 19,998 |  | $ | 383 |  | $ | (31 | )
MBS pass-through securities issued by FHLMC and FNMA | 97,222 |  | 94,735 |  | 12 |  | (2,499 | ) |  | 100,376 |  | 100,096 |  | 234 |  | (514 | )
CMOs issued by FHLMC | 32,192 |  | 31,226 |  | 1 |  | (967 | ) |  | 31,010 |  | 30,938 |  | 2 |  | (74 | )
Total held-to-maturity | 149,013 |  | 145,818 |  | 291 |  | (3,486 | ) |  | 151,032 |  | 151,032 |  | 619 |  | (619 | )
Available-for-sale: |  |  |  |  |  |  |  |  |
Securities of U.S. government agencies: |  |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | 93,915 |  | 92,029 |  | 22 |  | (1,908 | ) |  | 65,559 |  | 65,262 |  | 126 |  | (423 | )
SBA-backed securities | 33,809 |  | 33,538 |  | 8 |  | (279 | ) |  | 25,979 |  | 25,982 |  | 58 |  | (55 | )
CMOs issued by FNMA | 34,210 |  | 33,613 |  | 9 |  | (606 | ) |  | 35,340 |  | 35,125 |  | 33 |  | (248 | )
CMOs issued by FHLMC | 123,007 |  | 120,374 |  | 60 |  | (2,693 | ) |  | 70,514 |  | 69,889 |  | 3 |  | (628 | )
CMOs issued by GNMA | 17,173 |  | 16,650 |  | 5 |  | (528 | ) |  | 17,953 |  | 17,785 |  | 26 |  | (194 | )
Debentures of government- sponsored agencies | 27,446 |  | 27,336 |  | 6 |  | (116 | ) |  | 12,940 |  | 12,938 |  | 3 |  | (5 | )
Privately issued CMOs | 1,389 |  | 1,390 |  | 3 |  | (2 | ) |  | 1,432 |  | 1,431 |  | 1 |  | (2 | )
Obligations of state and political subdivisions | 95,395 |  | 93,414 |  | 99 |  | (2,080 | ) |  | 98,027 |  | 97,491 |  | 298 |  | (834 | )
Corporate bonds | 5,527 |  | 5,538 |  | 27 |  | (16 | ) |  | 6,541 |  | 6,564 |  | 26 |  | (3 | )
Total available-for-sale | 431,871 |  | 423,882 |  | 239 |  | (8,228 | ) |  | 334,285 |  | 332,467 |  | 574 |  | (2,392 | )
Total investment securities | $ | 580,884 |  | $ | 569,700 |  | $ | 530 |  | $ | (11,714 | ) |  | $ | 485,317 |  | $ | 483,499 |  | $ | 1,193 |  | $ | (3,011 | )
Available-for-sale Securities | Our investment securities portfolio consists of obligations of state and political subdivisions, corporate bonds, U.S. government agency securities, including residential and commercial mortgage-backed securities (“MBS”) and collateralized mortgage obligations (“CMOs”) issued or guaranteed by Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), or Government National Mortgage Association ("GNMA"), debentures issued by government-sponsored agencies such as FNMA, Federal Farm Credit Bureau, FHLB and FHLMC, as well as privately issued CMOs, as reflected in the following table:
| March 31, 2018 |  | December 31, 2017
| Amortized | Fair | Gross Unrealized |  | Amortized | Fair | Gross Unrealized
(in thousands) | Cost | Value | Gains | (Losses) |  | Cost | Value | Gains | (Losses)
Held-to-maturity: |  |  |  |  |  |  |  |  |
Obligations of state and political subdivisions | $ | 19,599 |  | $ | 19,857 |  | $ | 278 |  | $ | (20 | ) |  | $ | 19,646 |  | $ | 19,998 |  | $ | 383 |  | $ | (31 | )
MBS pass-through securities issued by FHLMC and FNMA | 97,222 |  | 94,735 |  | 12 |  | (2,499 | ) |  | 100,376 |  | 100,096 |  | 234 |  | (514 | )
CMOs issued by FHLMC | 32,192 |  | 31,226 |  | 1 |  | (967 | ) |  | 31,010 |  | 30,938 |  | 2 |  | (74 | )
Total held-to-maturity | 149,013 |  | 145,818 |  | 291 |  | (3,486 | ) |  | 151,032 |  | 151,032 |  | 619 |  | (619 | )
Available-for-sale: |  |  |  |  |  |  |  |  |
Securities of U.S. government agencies: |  |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | 93,915 |  | 92,029 |  | 22 |  | (1,908 | ) |  | 65,559 |  | 65,262 |  | 126 |  | (423 | )
SBA-backed securities | 33,809 |  | 33,538 |  | 8 |  | (279 | ) |  | 25,979 |  | 25,982 |  | 58 |  | (55 | )
CMOs issued by FNMA | 34,210 |  | 33,613 |  | 9 |  | (606 | ) |  | 35,340 |  | 35,125 |  | 33 |  | (248 | )
CMOs issued by FHLMC | 123,007 |  | 120,374 |  | 60 |  | (2,693 | ) |  | 70,514 |  | 69,889 |  | 3 |  | (628 | )
CMOs issued by GNMA | 17,173 |  | 16,650 |  | 5 |  | (528 | ) |  | 17,953 |  | 17,785 |  | 26 |  | (194 | )
Debentures of government- sponsored agencies | 27,446 |  | 27,336 |  | 6 |  | (116 | ) |  | 12,940 |  | 12,938 |  | 3 |  | (5 | )
Privately issued CMOs | 1,389 |  | 1,390 |  | 3 |  | (2 | ) |  | 1,432 |  | 1,431 |  | 1 |  | (2 | )
Obligations of state and political subdivisions | 95,395 |  | 93,414 |  | 99 |  | (2,080 | ) |  | 98,027 |  | 97,491 |  | 298 |  | (834 | )
Corporate bonds | 5,527 |  | 5,538 |  | 27 |  | (16 | ) |  | 6,541 |  | 6,564 |  | 26 |  | (3 | )
Total available-for-sale | 431,871 |  | 423,882 |  | 239 |  | (8,228 | ) |  | 334,285 |  | 332,467 |  | 574 |  | (2,392 | )
Total investment securities | $ | 580,884 |  | $ | 569,700 |  | $ | 530 |  | $ | (11,714 | ) |  | $ | 485,317 |  | $ | 483,499 |  | $ | 1,193 |  | $ | (3,011 | )
Investments Classified by Contractual Maturity Date | The amortized cost and fair value of investment debt securities by contractual maturity at March 31, 2018 are shown in the following table. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties.
| March 31, 2018 |  | December 31, 2017
| Held-to-Maturity |  | Available-for-Sale |  | Held-to-Maturity |  | Available-for-Sale
(in thousands) | Amortized Cost | Fair Value |  | Amortized Cost | Fair Value |  | Amortized Cost | Fair Value |  | Amortized Cost | Fair Value
Within one year | $ | 3,230 |  | $ | 3,256 |  |  | $ | 10,291 |  | $ | 10,281 |  |  | $ | 2,151 |  | $ | 2,172 |  |  | $ | 10,268 |  | $ | 10,272 |
After one but within five years | 14,458 |  | 14,599 |  |  | 77,606 |  | 76,619 |  |  | 15,577 |  | 15,791 |  |  | 71,576 |  | 71,237 |
After five years through ten years | 53,048 |  | 51,589 |  |  | 225,526 |  | 220,904 |  |  | 54,641 |  | 54,554 |  |  | 129,723 |  | 128,954 |
After ten years | 78,277 |  | 76,374 |  |  | 118,448 |  | 116,078 |  |  | 78,663 |  | 78,515 |  |  | 122,718 |  | 122,004 |
Total | $ | 149,013 |  | $ | 145,818 |  |  | $ | 431,871 |  | $ | 423,882 |  |  | $ | 151,032 |  | $ | 151,032 |  |  | $ | 334,285 |  | $ | 332,467 |
Schedule of Financial Instruments Owned and Pledged as Collateral | Pledged investment securities are shown in the following table:
(in thousands) | March 31, 2018 | December 31, 2017
Pledged to the State of California: |  |
Secure public deposits in compliance with the Local Agency Security Program | $ | 102,738 |  | $ | 107,829 |
Collateral for trust deposits | 754 |  | 761 |
Total investment securities pledged to the State of California | $ | 103,492 |  | $ | 108,590 |
Collateral for Wealth Management and Trust Services ("WMTS") checking account | $ | 2,018 |  | $ | 2,026 |
Schedule of Unrealized Loss on Investments | There were 258 and 198 investment securities in unrealized loss positions at March 31, 2018 and December 31, 2017, respectively. Those securities are summarized and classified according to the duration of the loss period in the following tables:
March 31, 2018 | < 12 continuous months |  | ≥ 12 continuous months |  | Total securities in a loss position
(in thousands) | Fair value | Unrealized loss |  | Fair value | Unrealized loss |  | Fair value | Unrealized loss
Held-to-maturity: |  |  |  |  |  |  |  |
Obligations of state and political subdivisions | $ | 3,636 |  | $ | (20 | ) |  | $ | — |  | $ | — |  |  | $ | 3,636 |  | $ | (20 | )
MBS pass-through securities issued by FHLMC and FNMA | 22,570 |  | (611 | ) |  | 69,808 |  | (1,888 | ) |  | 92,378 |  | (2,499 | )
CMOs issued by FHLMC | 16,571 |  | (445 | ) |  | 12,667 |  | (522 | ) |  | 29,238 |  | (967 | )
Total held-to-maturity | 42,777 |  | (1,076 | ) |  | 82,475 |  | (2,410 | ) |  | 125,252 |  | (3,486 | )
Available-for-sale: |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | 71,449 |  | (1,314 | ) |  | 18,895 |  | (594 | ) |  | 90,344 |  | (1,908 | )
SBA-backed securities | 24,816 |  | (277 | ) |  | 165 |  | (2 | ) |  | 24,981 |  | (279 | )
CMOs issued by FNMA | 28,289 |  | (473 | ) |  | 5,061 |  | (133 | ) |  | 33,350 |  | (606 | )
CMOs issued by FHLMC | 107,801 |  | (2,693 | ) |  | — |  | — |  |  | 107,801 |  | (2,693 | )
CMOs issued by GNMA | 15,955 |  | (528 | ) |  | — |  | — |  |  | 15,955 |  | (528 | )
Debentures of government- sponsored agencies | 12,330 |  | (116 | ) |  | — |  | — |  |  | 12,330 |  | (116 | )
Privately issued CMOs | 862 |  | (2 | ) |  | — |  | — |  |  | 862 |  | (2 | )
Obligations of state and political subdivisions | 63,831 |  | (920 | ) |  | 18,880 |  | (1,160 | ) |  | 82,711 |  | (2,080 | )
Corporate bonds | 4,032 |  | (16 | ) |  | — |  | — |  |  | 4,032 |  | (16 | )
Total available-for-sale | 329,365 |  | (6,339 | ) |  | 43,001 |  | (1,889 | ) |  | 372,366 |  | (8,228 | )
Total temporarily impaired securities | $ | 372,142 |  | $ | (7,415 | ) |  | $ | 125,476 |  | $ | (4,299 | ) |  | $ | 497,618 |  | $ | (11,714 | )
December 31, 2017 | < 12 continuous months |  | ≥ 12 continuous months |  | Total securities in a loss position
(in thousands) | Fair value | Unrealized loss |  | Fair value | Unrealized loss |  | Fair value | Unrealized loss
Held-to-maturity: |  |  |  |  |  |  |  |
Obligations of state and political subdivisions | $ | 3,648 |  | $ | (31 | ) |  | $ | — |  | $ | — |  |  | $ | 3,648 |  | $ | (31 | )
MBS pass-through securities issued by FHLMC and FNMA | $ | 16,337 |  | $ | (143 | ) |  | $ | 46,845 |  | $ | (371 | ) |  | $ | 63,182 |  | $ | (514 | )
CMOs issued by FHLMC | 11,066 |  | (31 | ) |  | 13,824 |  | (43 | ) |  | 24,890 |  | (74 | )
Total held-to-maturity | 31,051 |  | (205 | ) |  | 60,669 |  | (414 | ) |  | 91,720 |  | (619 | )
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | 32,189 |  | (121 | ) |  | 15,325 |  | (302 | ) |  | 47,514 |  | (423 | )
SBA-backed securities | 11,028 |  | (53 | ) |  | 165 |  | (2 | ) |  | 11,193 |  | (55 | )
CMOs issued by FNMA | 26,401 |  | (171 | ) |  | 5,440 |  | (77 | ) |  | 31,841 |  | (248 | )
CMOs issued by FHLMC | 69,276 |  | (628 | ) |  | — |  | — |  |  | 69,276 |  | (628 | )
CMOs issued by GNMA | 14,230 |  | (194 | ) |  | — |  | — |  |  | 14,230 |  | (194 | )
Debentures of government- sponsored agencies | 2,984 |  | (5 | ) |  | — |  | — |  |  | 2,984 |  | (5 | )
Privately issued CMO's | 1,310 |  | (2 | ) |  | — |  | — |  |  | 1,310 |  | (2 | )
Obligations of state and political subdivisions | 52,197 |  | (288 | ) |  | 19,548 |  | (546 | ) |  | 71,745 |  | (834 | )
Corporate bonds | 3,060 |  | (3 | ) |  | — |  | — |  |  | 3,060 |  | (3 | )
Total available-for-sale | 212,675 |  | (1,465 | ) |  | 40,478 |  | (927 | ) |  | 253,153 |  | (2,392 | )
Total temporarily impaired securities | $ | 243,726 |  | $ | (1,670 | ) |  | $ | 101,147 |  | $ | (1,341 | ) |  | $ | 344,873 |  | $ | (3,011 | )

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