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Investments (Tables)
 6 Months Ended
Jun. 30, 2023
Investments [Abstract]  
Debt Securities, Available-for-sale
June 30, 2023December 31, 2022
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Securities available-for-sale:        
Obligations of states and     
political subdivisions$245,922 $160 $20,481 $225,601 $292,293 $346 $24,324 $268,315 
Mortgage-backed securities:     
U.S. government agencies1,300,980 214 142,736 1,158,458 1,342,666 299 140,686 1,202,279 
Private label7,288 — 498 6,790 7,695 — 464 7,231 
Trust preferred securities4,595 — 403 4,192 4,590 — 762 3,828 
Corporate securities28,085 — 3,193 24,892 26,620 — 2,753 23,867 
Total Securities Available-for-Sale$1,586,870 $374 $167,311 $1,419,933 $1,673,864 $645 $168,989 $1,505,520 
Gross Unrealized Losses And Fair Value Of Investments The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
June 30, 2023
Less Than Twelve MonthsTwelve Months or GreaterTotal
Estimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized Loss
Securities available-for-sale:      
Obligations of states and political subdivisions$43,264 $1,102 $169,087 $19,379 $212,351 $20,481 
Mortgage-backed securities:  
U.S. Government agencies105,588 16,261 746,989 126,475 852,577 142,736 
     Private label— — 6,690 498 6,690 498 
Trust preferred securities — — 4,192 403 4,192 403 
Corporate securities11,204 1,359 13,688 1,834 24,892 3,193 
Total available-for-sale$160,056 $18,722 $940,646 $148,589 $1,100,702 $167,311 
December 31, 2022
Less Than Twelve MonthsTwelve Months or GreaterTotal
Estimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized LossEstimated Fair ValueUnrealized Loss
Securities available-for-sale:      
Obligations of states and political subdivisions$203,173 $21,929 $13,359 $2,395 $216,532 $24,324 
Mortgage-backed securities:  
U.S. Government agencies533,611 50,268 376,778 90,418 910,389 140,686 
Private label7,126 464 — — 7,126 464 
Trust preferred securities— — 3,828 762 3,828 762 
Corporate securities22,972 2,648 895 105 23,867 2,753 
Total available-for-sale$766,882 $75,309 $394,860 $93,680 $1,161,742 $168,989 
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity
The amortized cost and estimated fair value of debt securities at June 30, 2023, by contractual maturity, is shown in the following table (in thousands).  Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.  Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.
Amortized CostEstimated Fair Value
Available-for-Sale Debt Securities  
Due in one year or less$1,814 $1,796 
Due after one year through five years51,378 47,776 
Due after five years through ten years511,736 472,381 
Due after ten years1,021,942 897,980 
Total$1,586,870 $1,419,933 
Gross Gains And Losses Realized
Gross gains and gross losses recognized by the Company from investment security transactions are summarized in the table below (in thousands):
Three months ended June 30,Six months ended June 30,
2023202220232022
Gross realized gains on securities sold$— $— $975 $— 
Gross realized losses on securities sold— — (202)— 
Net investment security gains $— $— $773 $— 
Gross unrealized gains recognized on equity securities still held$8 $2 $368 $42 
Gross unrealized losses recognized on equity securities still held(302)(603)(301)(1,366)
Net unrealized gains recognized on equity securities still held$(294)$(601)$67 $(1,324)