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Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Summary Comparison of Securities by Type
A summary comparison of securities by type at December 31, 2023 and 2022 is shown below.

December 31, 2023December 31, 2022
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair ValueAmortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available for sale:        
U.S. Treasuries$50,048 $— $(218)$49,830 $100,642 $— $(2,142)$98,500 
U.S. Government Agencies— — — — — — — — 
Corporate debt securities16,750 3 (1,279)15,474 16,750 — (752)15,998 
Municipal bonds13,522 31 (372)13,181 14,742 31 (426)14,347 
Mortgage-backed securities5,144 — (144)5,000 2,711 — (98)2,613 
Total available for sale securities$85,464 $34 $(2,013)$83,485 $134,845 $31 $(3,418)$131,458 
Held to maturity:        
U.S. Government Agencies$265,896 $— $(61,532)$204,364 $265,032 $— $(69,503)$195,529 
Corporate debt securities54,822 — (5,602)49,220 55,036 — (8,005)47,031 
Total held to maturity securities$320,718 $— $(67,134)$253,584 $320,068 $— $(77,508)$242,560 
Schedule of Investments Classified by Contractual Maturity Date For this reason they are presented separately in the maturity table below.
 December 31, 2023
(in thousands)Amortized CostFair Value
Available for sale:  
Due in one year or less$50,858 $50,637 
Due after one year through five years2,784 2,762 
Due after five years through 10 years20,041 18,764 
Over 10 years6,637 6,322 
Subtotal80,320 78,485 
Mortgage-backed Securities5,144 5,000 
Total available for sale securities$85,464 $83,485 
Held to maturity:
Due in one year or less$— $— 
Due after one year through five years2,004 1,865 
Due after five years through 10 years115,574 100,500 
Over 10 years203,140 151,219 
Total held to maturity securities$320,718 $253,584 
Schedule of Unrealized Loss on Investments
The following is a summary of the fair value of securities with gross unrealized losses and an aging of those gross unrealized losses at December 31, 2023.

 December 31, 2023
 Less Than 12 Months12 Months or MoreTotal
(in thousands)Number
of Securities		Fair ValueGross
Unrealized Losses		Number
of Securities		Fair ValueGross
Unrealized Losses		Number
of Securities		Fair ValueGross
Unrealized Losses
Available for sale:         
U.S. Treasuries— $— $— 3 $49,830 $(218)3 $49,830 $(218)
U.S. Government Agencies— — — — — — — — — 
Corporate debt securities— — — 15 14,471 (1,279)15 14,471 (1,279)
Municipal bonds12 3,417 (6)41 5,895 (366)53 9,312 (372)
Mortgage-backed securities2 2,606 (21)5 2,394 (123)7 5,000 (144)
Total available for sale securities14 $6,023 $(27)64 $72,590 $(1,986)78 $78,613 $(2,013)
Held to maturity:
U.S. Government Agencies— $— — 29 $204,364 $(61,532)29 $204,364 $(61,532)
Corporate debt securities— — — 57 49,220 (5,602)57 49,220 (5,602)
Total held to maturity securities— $— $— 86 $253,584 $(67,134)86 $253,584 $(67,134)

The following is a summary of the fair value of securities with gross unrealized losses and an aging of those gross unrealized losses at December 31, 2022.

 December 31, 2022
 Less Than 12 Months12 Months or MoreTotal
(in thousands)Number
of Securities		Fair ValueGross
Unrealized Losses		Number
of Securities		Fair ValueGross
Unrealized Losses		Number
of Securities		Fair ValueGross
Unrealized Losses
Available for sale:         
U.S. Treasuries— $— $— 6 $98,500 $(2,142)6 $98,500 $(2,142)
U.S. Government Agencies— — — — — — — — — 
Corporate debt securities14 14,628 (622)2 1,370 (130)16 15,998 (752)
Municipal bonds46 5,854 (394)6 673 (32)52 6,527 (426)
Mortgage-backed securities3 2,608 (98)4 5 — 7 2,613 (98)
Total available for sale securities63 $23,090 $(1,114)18 $100,548 $(2,304)81 $123,638 $(3,418)
Held to maturity:
U.S. Government Agencies13 $89,695 (21,724)16 $105,834 $(47,779)29 $195,529 $(69,503)
Corporate debt securities59 47,031 (8,005)— — — 59 47,031 (8,005)
Total held to maturity securities72 $136,726 $(29,729)16 $105,834 $(47,779)88 $242,560 $(77,508)
Schedule of Exposure to Investment Securities Issuers that Exceeded 10% of Shareholder's Equity
At December 31, 2023, First Guaranty's exposure to investment securities issuers that exceeded 10% of shareholders' equity was as follows:

 December 31, 2023
(in thousands)Amortized CostFair Value
U.S. Government Treasuries (U.S.)$50,048 $49,830 
Federal Home Loan Bank (FHLB)32,196 26,109 
Federal Home Loan Mortgage Corporation (Freddie Mac-FHLMC)97,488 69,941 
Federal Farm Credit Bank (FFCB)138,730 110,707 
Total$318,462 $256,587