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Investment Securities - (Tables)
3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Held-to-Maturity Investments
Our investment securities portfolio consists of obligations of state and political subdivisions, U.S. Corporations, U.S. federal government agencies such as Government National Mortgage Association ("GNMA") and Small Business Administration ("SBA"), U.S. government-sponsored enterprises ("GSEs"), such as Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), Federal Farm Credit Banks Funding Corporation and FHLB. We also invest in residential and commercial mortgage-backed securities (“MBS”/"CMBS") and collateralized mortgage obligations (“CMOs”) issued or guaranteed by the GSEs, as reflected in the following table.

A summary of the amortized cost, fair value and allowance for credit losses related to securities held-to-maturity as of March 31, 2021 and December 31, 2020 is presented below.

Held-to-maturity:
Amortized Cost 1
Allowance for Credit LossesNet Carrying AmountGross UnrealizedFair Value
(in thousands)Gains(Losses)
March 31, 2021
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC and FNMA$78,227 $— $78,227 $3,283 $— $81,510 
CMOs issued by FHLMC30,207 — 30,207 1,105 (189)31,123 
CMOs issued by FNMA7,305 — 7,305 347 — 7,652 
SBA-backed securities5,699 — 5,699 227 — 5,926 
Debentures of government-sponsored agencies29,950 — 29,950 — — 29,950 
Obligations of state and political subdivisions582 — 582 13 — 595 
Total held-to-maturity$151,970 $— $151,970 $4,975 $(189)$156,756 
December 31, 2020
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC and FNMA$65,579 $— $65,579 $3,924 $— $69,503 
CMOs issued by FHLMC27,201 — 27,201 1,441 — 28,642 
  CMOs issued by FNMA8,042 — 8,042 363 — 8,405 
  SBA-backed securities6,547 — 6,547 400 — 6,947 
Obligations of state and political subdivisions1,667 — 1,667 21 — 1,688 
Total held-to-maturity$109,036 $— $109,036 $6,149 $— $115,185 
1 Amortized cost and fair values exclude accrued interest receivable of $295 thousand and $366 thousand at March 31, 2021 and December 31, 2020, respectively, which is included in interest receivable and other assets in the consolidated statements of condition.
Schedule of Bond Ratings for Held-to-Maturity Securities
The following table summarizes the amortized cost of our portfolio of held-to-maturity securities issued by states and political subdivisions by Moody's and/or Standard & Poor's bond ratings as of March 31, 2021.

(in thousands)Obligations of state and political subdivisions
AA$377 
A205 
Total$582 
Summary of Available-for-Sale Investments
A summary of the amortized cost, fair value and allowance for credit losses related to securities available-for-sale as of March 31, 2021 and December 31, 2020 is presented below.

Available-for-sale:
Amortized Cost 1
Gross UnrealizedAllowance for Credit LossesFair Value
(in thousands)Gains(Losses)
March 31, 2021
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC and FNMA$65,871 $2,199 $(56)$— $68,014 
CMOs issued by FHLMC168,589 5,525 (948)— 173,166 
CMOs issued by FNMA21,663 537 (31)— 22,169 
CMOs issued by GNMA23,738 236 — — 23,974 
SBA-backed securities28,059 1,212 (53)— 29,218 
Debentures of government- sponsored agencies76,313 201 (2,041)— 74,473 
Obligations of state and political subdivisions118,118 3,842 (195)— 121,765 
Corporate bonds5,986 — (197)— 5,789 
Total available-for-sale$508,337 $13,752 $(3,521)$— $518,568 
December 31, 2020
Securities of U.S. government-sponsored enterprises:
MBS pass-through securities issued by FHLMC and FNMA$50,686 $2,530 $— $— $53,216 
CMOs issued by FHLMC143,267 7,925 (1)— 151,191 
CMOs issued by FNMA16,450 580 — — 17,030 
CMOs issued by GNMA6,863 351 — — 7,214 
SBA-backed securities30,941 1,976 (55)— 32,862 
Debentures of government- sponsored agencies19,944 266 (24)— 20,186 
Obligations of state and political subdivisions104,887 5,765 — — 110,652 
Total available-for-sale$373,038 $19,393 $(80)$— $392,351 
1 Amortized cost and fair value exclude accrued interest receivable of $1.9 million at both March 31, 2021 and December 31, 2020, which is included in interest receivable and other assets in the consolidated statements of condition.
Investments Classified by Contractual Maturity Date
The amortized cost and fair value of investment debt securities by contractual maturity at March 31, 2021 and December 31, 2020 are shown below. 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, 2021December 31, 2020
 Held-to-MaturityAvailable-for-SaleHeld-to-MaturityAvailable-for-Sale
(in thousands)Amortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair Value
Within one year$246 $248 $15,013 $15,219 $246 $250 $11,530 $11,687 
After one but within five years8,847 9,284 55,101 57,955 7,550 7,961 59,028 62,397 
After five years through ten years62,415 65,241 193,424 198,301 52,113 55,872 144,908 154,089 
After ten years80,462 81,983 244,799 247,093 49,127 51,102 157,572 164,178 
Total$151,970 $156,756 $508,337 $518,568 $109,036 $115,185 $373,038 $392,351 
Sale of Investment Securities and Gross Gains and Losses
Sales of investment securities and gross gains and losses are shown in the following table:
 Three months ended
(in thousands)March 31, 2021March 31, 2020
Available-for-sale:
Sales proceeds$— $27,442 
Gross realized gains— 800 
Schedule of Financial Instruments Owned and Pledged as Collateral
Pledged investment securities are shown in the following table:
(in thousands)March 31, 2021December 31, 2020
Pledged to the State of California:
Secure public deposits in compliance with the Local Agency Security Program$123,085 $131,051 
Collateral for trust deposits735 751 
Total investment securities pledged to the State of California123,820 131,802 
Collateral for Wealth Management and Trust Services checking account614 629 
Total pledged investment securities$124,434 $132,431 
Schedule of Unrealized Loss on Investments
There were 29 and 10 securities in unrealized loss positions at March 31, 2021 and December 31, 2020, respectively. Those securities are summarized and classified according to the duration of the loss period in the tables below:
March 31, 2021< 12 continuous months≥ 12 continuous monthsTotal securities
 in a loss position
(in thousands)Fair valueUnrealized lossFair valueUnrealized lossFair valueUnrealized loss
Held-to-maturity:
CMOs issued by FHLMC$4,235 $(189)$— $— $4,235 $(189)
Total held-to-maturity4,235 (189)— — 4,235 (189)
Available-for-sale:
MBS pass-through securities issued by FHLMC and FNMA10,013 (56)— — 10,013 (56)
SBA-backed securities— — 1,699 (53)1,699 (53)
CMOs issued by FNMA7,304 (31)— — 7,304 (31)
CMOs issued by FHLMC32,658 (948)— — 32,658 (948)
Debentures of government- sponsored agencies53,289 (2,041)— — 53,289 (2,041)
Obligations of state and political subdivisions28,529 (195)— — 28,529 (195)
Corporate bonds5,789 (197)— — 5,789 (197)
Total available-for-sale137,582 (3,468)1,699 (53)139,281 (3,521)
Total temporarily impaired securities$141,817 $(3,657)$1,699 $(53)$143,516 $(3,710)
December 31, 2020< 12 continuous months≥ 12 continuous monthsTotal securities
 in a loss position
(in thousands)Fair valueUnrealized lossFair valueUnrealized lossFair valueUnrealized loss
Available-for-sale:
SBA-backed securities$— $— $1,790 $(55)$1,790 $(55)
CMOs issued by FHLMC5,975 (1)— — 5,975 (1)
Debentures of government- sponsored agencies3,943 (24)— — 3,943 (24)
Total available-for-sale9,918 (25)1,790 (55)11,708 (80)
Total temporarily impaired securities$9,918 $(25)$1,790 $(55)$11,708 $(80)