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Held to Maturity Debt Securities (Tables)
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Held to Maturity
Held to maturity debt securities at December 31, 2020 and 2019 are summarized as follows (in thousands):
 2020
 
Amortized
cost
Gross
unrealized
gains
Gross
unrealized
losses
Allowance for credit losses
Fair
value
Agency obligations$7,600 (5)— 7,601 
Mortgage-backed securities62 — — 64 
State and municipal obligations433,655 21,442 (58)(66)454,973 
Corporate obligations9,726 101 (2)(12)9,813 
$451,043 21,551 (65)(78)472,451 
At December 31, 2020, total amortized cost, net of allowance for credit losses totaled $451.0 million.
 2019
 
Amortized
cost
Gross
unrealized
gains
Gross
unrealized
losses
Allowance for credit losses
Fair
value
Agency obligations$6,599 11 (9)— 6,601 
Mortgage-backed securities118 — — 122 
State and municipal obligations437,074 14,394 (115)— 451,353 
Corporate obligations9,838 58 (6)— 9,890 
$453,629 14,467 (130)— 467,966 
Securities Held to Maturity by Contractual Maturity The amortized cost and fair value of held to maturity debt securities at December 31, 2020 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
 2020
 
Amortized
cost
Fair
value
Due in one year or less$21,623 21,736 
Due after one year through five years133,869 137,978 
Due after five years through ten years216,671 229,902 
Due after ten years78,818 82,849 
$450,981 472,465 
Schedule of Impact of ASC 326
The following table illustrates the impact of the January 1, 2020 adoption of CECL on held to maturity debt securities (in thousands):
January 1, 2020
As reported under CECLPrior to CECLImpact of CECL adoption
Held to Maturity Debt Securities
Allowance for credit losses on corporate securities$— 
Allowance for credit losses on municipal securities64 — 64 
Allowance for credit losses on held to maturity debt securities$70 — 70 
The following tables represent the Company's disclosure on
The following table illustrates the impact of the January 1, 2020 adoption of CECL on the allowance for credit losses related to the loan portfolio (in thousands):
January 1, 2020
As reported under CECLPrior to CECLImpact of CECL adoption
Loans
Residential$8,950 3,414 5,536 
Commercial17,118 12,831 4,287 
Multi-family9,519 3,374 6,145 
Construction4,152 5,892 (1,740)
Total mortgage loans39,739 25,511 14,228 
Commercial loans18,254 28,263 (10,009)
Consumer loans5,452 1,751 3,701 
Allowance for credit losses on loans$63,445 55,525 7,920 
The following table illustrates the impact of the January 1, 2020 adoption of CECL on off-balance sheet credit exposures (dollars in thousands):
January 1, 2020
As reported under CECLPrior to CECLImpact of CECL adoption
Liabilities
Allowance for credit losses on off-balance sheet credit exposure$3,206 — 3,206 
Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment (in thousands):
 December 31, 2020 Unrealized Losses
 Less than 12 months12 months or longerTotal
 Fair value
Gross
unrealized
losses
Fair value
Gross
unrealized
losses
Fair value
Gross
unrealized
losses
Agency obligations$1,995 (5)— — 1,995 (5)
State and municipal obligations4,846 (41)406 (17)5,252 (58)
Corporate obligations786 (2)— — 786 (2)
$7,627 (48)406 (17)8,033 (65)
 December 31, 2019 Unrealized Losses
 Less than 12 months12 months or longerTotal
 Fair value
Gross
unrealized
losses
Fair value
Gross
unrealized
losses
Fair value
Gross
unrealized
losses
Agency obligations$3,601 (9)— — 3,601 (9)
State and municipal obligations7,675 (42)2,093 (73)9,768 (115)
Corporate obligations3,254 (6)— — 3,254 (6)
$14,530 (57)2,093 (73)16,623 (130)
Amortized Cost of held To Maturity Debt Securities by Year of Originations and Credit Rating
Credit Quality Indicators. The following table provides the amortized cost of held to maturity debt securities by credit rating as of December 31, 2020 (in thousands):
December 31, 2020
Total PortfolioAAAAAABBBNot RatedTotal
Agency obligations$7,600 — — — — 7,600 
Mortgage-backed securities62 — — — — 62 
State and municipal obligations57,830 311,155 53,302 1,115 10,253 433,655 
Corporate obligations— 3,255 6,446 — 25 9,726 
$65,492 314,410 59,748 1,115 10,278 451,043 
December 31, 2019
Total PortfolioAAAAAABBBNot RatedTotal
Agency obligations$6,599 — — — — 6,599 
Mortgage-backed securities118 — — — — 118 
State and municipal obligations49,316 330,322 56,317 1,119 — 437,074 
Corporate obligations— 3,128 6,335 350 25 9,838 
$56,033 333,450 62,652 1,469 25 453,629