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Securities (Tables)
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Available-for-sale
The amortized cost, estimated fair value and allowance for credit losses of debt securities available-for-sale and held-to-maturity at December 31, 2020 and 2019 are as follows (in thousands):
 Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Allowance for Credit Losses
At December 31, 2020
Debt securities available-for-sale:
Investment securities:
U.S. government and agency obligations
$173,790 $3,152 $(2)$176,940 $— 
Collateralized loan obligations6,174 — (4)6,170 — 
Total investment securities179,964 3,152 (6)183,110 — 
Mortgage-backed securities - FNMA190 — 192 — 
Total debt securities available-for-sale$180,154 $3,154 $(6)$183,302 $— 
Debt securities held-to-maturity:
Investment securities:
State and municipal obligations$238,405 $11,500 $(231)$249,674 $(48)
Corporate debt securities72,305 1,615 (2,652)71,268 (1,550)
Total investment securities310,710 13,115 (2,883)320,942 (1,598)
Mortgage-backed securities:
FHLMC232,942 5,383 (124)238,201 — 
FNMA293,615 7,640 (147)301,108 — 
GNMA67,334 2,014 (12)69,336 — 
SBA5,392 — (60)5,332 — 
CMO32,321 1,226 — 33,547 (117)
Total mortgage-backed securities631,604 16,263 (343)647,524 (117)
Total debt securities held-to-maturity$942,314 $29,378 $(3,226)$968,466 $(1,715)
Total debt securities$1,122,468 $32,532 $(3,232)$1,151,768 $(1,715)
There was no allowance for credit losses on debt securities available-for-sale at December 31, 2020.

 
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
At December 31, 2019
Debt securities available-for-sale:
Investment securities:
U.S. government and agency obligations$149,120 $1,408 $(93)$150,435 
State and municipal obligations25 — — 25 
Total investment securities149,145 1,408 (93)150,460 
Mortgage-backed securities - FNMA495 — 500 
Total debt securities available-for-sale$149,640 $1,413 $(93)$150,960 
Debt securities held-to-maturity:
Investment securities:
U.S. government and agency obligations$4,984 $14 $— $4,998 
State and municipal obligations124,430 1,537 (208)125,759 
Corporate debt securities79,547 833 (2,421)77,959 
Total investment securities208,961 2,384 (2,629)208,716 
Mortgage-backed securities:
FHLMC206,985 2,221 (524)208,682 
FNMA244,428 2,680 (493)246,615 
GNMA110,661 939 (212)111,388 
SBA1,940 — (51)1,889 
Total mortgage-backed securities564,014 5,840 (1,280)568,574 
Total debt securities held-to-maturity$772,975 $8,224 $(3,909)$777,290 
Total debt securities$922,615 $9,637 $(4,002)$928,250 
Debt Securities, Held-to-maturity, Allowance for Credit Loss
The following table presents the activity in the allowance for credit losses for debt securities held-to-maturity by major security type for the year ended December 31, 2020 (in thousands):
Investment SecuritiesMortgage-backed Securities
Allowance for credit losses
Beginning balance$— $— 
Impact of CECL adoption(1,268)— 
Provision for credit loss expense(330)(117)
Total ending allowance balance$(1,598)$(117)
Carrying Value of Held-to-Maturity Investment Securities The carrying value of the debt securities held-to-maturity at December 31, 2020 and 2019 are as follows (in thousands):
 December 31,
 20202019
Amortized cost$942,314 $772,975 
Net loss on date of transfer from available-for-sale(13,347)(13,347)
Allowance for credit loss(1,715)— 
Accretion of net unrealized loss on securities reclassified as held-to-maturity10,001 9,245 
Carrying value$937,253 $768,873 
The realized and unrealized gains on equity securities for the year ended December 31, 2020 are shown in the table below (in thousands).
For the year ended
December 31, 2020
Net gain on equity investments$21,214 
Less: Net gains recognized on equity securities sold5,401 
Unrealized gain recognized on equity securities still held$15,813 
Debt Securities, Trading, and Equity Securities, FV-NI
Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity
The amortized cost and estimated fair value of investment securities at December 31, 2020 by contractual maturity, are shown below (in thousands). Actual maturities may differ from contractual maturities in instances where issuers have the right to call or prepay obligations with or without call or prepayment penalties. At December 31, 2020, corporate debt securities with an amortized cost and estimated fair value of $53.8 million and $52.9 million, respectively, were callable prior to the maturity date.
December 31, 2020Amortized
Cost
Estimated
Fair Value
Less than one year$97,822 $98,394 
Due after one year through five years195,949 201,798 
Due after five years through ten years93,596 92,120 
Due after ten years103,307 111,740 
Total investment securities$490,674 $504,052 
Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity
The estimated fair value and unrealized losses for debt securities available-for-sale and held-to-maturity at December 31, 2020 and December 31, 2019, segregated by the duration of the unrealized losses, are as follows (in thousands): 
 As of December 31, 2020
 Less than 12 months12 months or longerTotal
 Estimated
Fair Value
Unrealized
Losses
Estimated
Fair Value
Unrealized
Losses
Estimated
Fair Value
Unrealized
Losses
Debt securities available-for-sale:
Investment securities - U.S. government and agency obligations
$17,029 $(2)$— $— $17,029 $(2)
Collateralized loan obligations4,766 (4)— — 4,766 (4)
Total debt securities available-for-sale21,795 (6)— — 21,795 (6)
Debt securities held-to-maturity:
Investment securities:
State and municipal obligations2,823 (23)7,509 (208)10,332 (231)
Corporate debt securities10,192 (255)35,935 (2,397)46,127 (2,652)
Total investment securities13,015 (278)43,444 (2,605)56,459 (2,883)
Mortgage-backed securities:
FHLMC24,661 (117)669 (7)25,330 (124)
FNMA39,365 (128)939 (19)40,304 (147)
GNMA5,856 (11)207 (1)6,063 (12)
SBA3,626 (12)1,706 (48)5,332 (60)
Total mortgage-backed securities73,508 (268)3,521 (75)77,029 (343)
Total debt securities held-to-maturity86,523 (546)46,965 (2,680)133,488 (3,226)
Total debt securities$108,318 $(552)$46,965 $(2,680)$155,283 $(3,232)
 As of December 31, 2019
 Less than 12 months12 months or longerTotal
 Estimated
Fair Value
Unrealized
Losses
Estimated
Fair Value
Unrealized
Losses
Estimated
Fair Value
Unrealized
Losses
Debt securities available-for-sale:
Investment securities - U.S. government and agency obligations
$25,021 $(54)$22,451 $(39)$47,472 $(93)
Total debt securities available-for-sale25,021 (54)22,451 (39)47,472 (93)
Debt securities held-to-maturity:
Investment securities:
State and municipal obligations7,308 (58)14,531 (150)21,839 (208)
Corporate debt securities9,727 (213)37,628 (2,208)47,355 (2,421)
Total investment securities17,035 (271)52,159 (2,358)69,194 (2,629)
Mortgage-backed securities:
FHLMC6,329 (29)38,641 (495)44,970 (524)
FNMA13,682 (59)38,568 (434)52,250 (493)
GNMA30,268 (93)19,828 (119)50,096 (212)
SBA— — 1,889 (51)1,889 (51)
Total mortgage-backed securities50,279 (181)98,926 (1,099)149,205 (1,280)
Total debt securities held-to-maturity67,314 (452)151,085 (3,457)218,399 (3,909)
Total debt securities$92,335 $(506)$173,536 $(3,496)$265,871 $(4,002)
Amortized Cost, Estimated Fair Value and Credit Rating of Corporate Debt Securities
At December 31, 2020, the amortized cost, estimated fair value and credit rating of the individual corporate debt securities in an unrealized loss position for greater than one year are as follows (in thousands):
 
As of December 31, 2020
Security DescriptionAmortized
Cost
Estimated
Fair Value
Credit Rating
Moody’s/S&P
Chase Capital$10,000 $9,479 Baa1/BBB-
Wells Fargo Capital5,000 4,702 A1/BBB-
Huntington Capital5,000 4,546 Baa2/BB+
Keycorp Capital5,000 4,647 Baa2/BB+
PNC Capital5,000 4,743 Baa1/BBB-
State Street Capital3,332 3,147 A3/BBB
SunTrust Capital5,000 4,671 Not Rated/BBB-
Total$38,332 $35,935 
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarized the amortized cost of debt securities held-to-maturity at December 31, 2020 aggregated by credit quality indicator (in thousands):
AAAAAABBBBBTotal
As of December 31, 2020
Investment securities:
State and municipal obligations$34,091 $130,218 $59,272 $14,824 $— $238,405 
Corporate debt securities— 496 11,978 48,498 11,333 72,305 
Total investment securities34,091 130,714 71,250 63,322 11,333 310,710 
Mortgage-backed securities:
CMO11,118 21,203 — — — 32,321 
Total mortgage-backed securities11,118 21,203 — — — 32,321 
Total debt securities held-to-maturity$45,209 $151,917 $71,250 $63,322 $11,333 $343,031