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Investments (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation
The following tables present the amortized cost, gross unrealized gains and losses, allowance of credit losses and fair value of securities available for sale and held to maturity:
 
 September 30, 2020
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Allowance for Credit LossesFair Value
Available-for-sale securities:    
Obligations of U.S. Government-sponsored enterprises$9,972 $228 $— $— $10,200 
Obligations of states and political subdivisions355,036 11,625 (539)— 366,122 
Agency mortgage-backed securities581,111 24,884 (46)— 605,949 
U.S. Treasury bills10,977 544 — — 11,521 
Corporate debt securities11,502 134 (2)— 11,634 
          Total securities available for sale$968,598 $37,415 $(587)$— $1,005,426 
Held-to-maturity securities:
Obligations of states and political subdivisions$95,497 $1,038 $— $(16)$96,519 
Agency mortgage-backed securities109,954 2,468 (148)— 112,274 
Corporate debt securities122,243 8,367 — (629)129,981 
          Total securities held-to-maturity$327,694 $11,873 $(148)$(645)$338,774 
Less: Allowance for credit losses645 
          Total securities held-to-maturity, net$327,049 
 December 31, 2019
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$9,954 $92 $— $10,046 
    Obligations of states and political subdivisions207,269 6,118 (363)213,024 
    Agency mortgage-backed securities888,129 15,083 (1,191)902,021 
U.S. Treasury Bills9,971 255 — 10,226 
          Total securities available for sale$1,115,323 $21,548 $(1,554)$1,135,317 
Held-to-maturity securities:
   Obligations of states and political subdivisions$11,704 $170 $— $11,874 
   Agency mortgage-backed securities46,346 675 — 47,021 
Corporate debt securities123,116 128 (200)123,044 
          Total securities held to maturity$181,166 $973 $(200)$181,939 
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation
The following tables present the amortized cost, gross unrealized gains and losses, allowance of credit losses and fair value of securities available for sale and held to maturity:
 
 September 30, 2020
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Allowance for Credit LossesFair Value
Available-for-sale securities:    
Obligations of U.S. Government-sponsored enterprises$9,972 $228 $— $— $10,200 
Obligations of states and political subdivisions355,036 11,625 (539)— 366,122 
Agency mortgage-backed securities581,111 24,884 (46)— 605,949 
U.S. Treasury bills10,977 544 — — 11,521 
Corporate debt securities11,502 134 (2)— 11,634 
          Total securities available for sale$968,598 $37,415 $(587)$— $1,005,426 
Held-to-maturity securities:
Obligations of states and political subdivisions$95,497 $1,038 $— $(16)$96,519 
Agency mortgage-backed securities109,954 2,468 (148)— 112,274 
Corporate debt securities122,243 8,367 — (629)129,981 
          Total securities held-to-maturity$327,694 $11,873 $(148)$(645)$338,774 
Less: Allowance for credit losses645 
          Total securities held-to-maturity, net$327,049 
 December 31, 2019
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$9,954 $92 $— $10,046 
    Obligations of states and political subdivisions207,269 6,118 (363)213,024 
    Agency mortgage-backed securities888,129 15,083 (1,191)902,021 
U.S. Treasury Bills9,971 255 — 10,226 
          Total securities available for sale$1,115,323 $21,548 $(1,554)$1,135,317 
Held-to-maturity securities:
   Obligations of states and political subdivisions$11,704 $170 $— $11,874 
   Agency mortgage-backed securities46,346 675 — 47,021 
Corporate debt securities123,116 128 (200)123,044 
          Total securities held to maturity$181,166 $973 $(200)$181,939 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities at September 30, 2020, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 3 years.
Available for saleHeld to maturity
(in thousands)Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Due in one year or less$3,139 $3,161 $— $— 
Due after one year through five years32,281 33,232 10,187 10,587 
Due after five years through ten years16,828 17,443 125,476 133,063 
Due after ten years335,239 345,641 82,077 82,850 
Agency mortgage-backed securities581,111 605,949 109,954 112,274 
 $968,598 $1,005,426 $327,694 $338,774 
Schedule of Unrealized Loss on Investments
The following table presents a summary of available-for-sale investment securities in an unrealized loss position:
 September 30, 2020
Less than 12 months12 months or moreTotal
(in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of states and political subdivisions$57,934 $539 $— $— $57,934 $539 
Agency mortgage-backed securities21,211 46 — — 21,211 46 
Corporate debt securities3,000 2 — — 3,000 2 
 $82,145 $587 $— $— $82,145 $587 
The following table presents a summary of available-for-sale and held-to-maturity investment securities in an unrealized loss position:
 December 31, 2019
Less than 12 months12 months or moreTotal
(in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of states and political subdivisions$56,327 $363 $— $— $56,327 $363 
Agency mortgage-backed securities131,693 756 41,491 435 173,184 1,191 
Corporate debt securities67,964 200 — — 67,964 200 
 $255,984 $1,319 $41,491 $435 $297,475 $1,754