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Debt Securities (Tables)
 3 Months Ended
Mar. 31, 2020
Debt Securities [Abstract]  
Schedule of Debt Securities, Available-for-sale
The amortized cost and fair value of investment debt securities AFS, with gross unrealized gains and losses, were as follows:
 As of March 31, 2020
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit Loss related to Debt SecuritiesEstimated Fair Value
U.S. Government agencies and corporations$421  $10  $—  $—  $431  
State and political subdivisions283,087  4,499  1,209  —  286,377  
Mortgage-backed securities
41,191  1,412  2  —  42,601  
Collateralized mortgage obligations301,287  6,804  1,231  —  306,860  
Corporate debt securities245,674  3,343  3,427  —  245,590  
Total debt securities
$871,660  $16,068  $5,869  $—  $881,859  
 
 As of December 31, 2019
(in thousands)
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair Value
U.S. Government agencies and corporations$439  $2  $—  $441  
State and political subdivisions253,750  3,803  348  257,205  
Mortgage-backed securities
43,009  536  15  43,530  
Collateralized mortgage obligations293,911  1,000  1,965  292,946  
Corporate debt securities188,952  3,018  115  191,855  
Total debt securities
$780,061  $8,359  $2,443  $785,977  
Schedule of Temporary Impairment Losses
The following table presents debt securities AFS in an unrealized loss position for which an allowance for credit losses has not been recorded at March 31, 2020, aggregated by investment category and length of time in a continuous loss position:  
  As of March 31, 2020
Number
of
Securities
Less than 12 Months12 Months or MoreTotal
Available for Sale
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
(in thousands, except number of securities) 
State and political subdivisions77  $33,845  $1,209  $—  $—  $33,845  $1,209  
Mortgage-backed securities
9  404  2  17  —  421  2  
Collateralized mortgage obligations
8  62,873  1,231  —  —  62,873  1,231  
Corporate debt securities28  105,435  3,342  1,316  85  106,751  3,427  
Total
122  $202,557  $5,784  $1,333  $85  $203,890  $5,869  
The following table presents information pertaining to debt securities with gross unrealized losses as of December 31, 2019, aggregated by investment category and length of time that individual securities have been in a continuous loss position:  
  As of December 31, 2019
Available for Sale
Number
of
Securities
Less than 12 Months12 Months or MoreTotal
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
(in thousands, except number of securities) 
State and political subdivisions47  $27,161  $322  $2,112  $26  $29,273  $348  
Mortgage-backed securities
7  963  12  1,365  3  2,328  15  
Collateralized mortgage obligations33  103,395  719  65,604  1,246  168,999  1,965  
Corporate debt securities7  7,012  14  8,788  101  15,800  115  
Total
94  $138,531  $1,067  $77,869  $1,376  $216,400  $2,443  
Schedule Proceeds and Realized Gains (Losses)
Proceeds and gross realized gains and losses on debt securities available for sale for the three months ended March 31, 2020 and 2019 were as follows:
Three Months Ended
(in thousands)March 31, 2020March 31, 2019
Proceeds from sales of debt securities available for sale$22,140  $7,280  
Gross realized gains from sales of debt securities available for sale155  26  
Gross realized losses from sales of debt securities available for sale(113) (9) 
Net realized gain from sales of debt securities available for sale$42  $17  
Investments Classified by Contractual Maturity Date
The contractual maturity distribution of investment debt securities at March 31, 2020, is shown below. Expected maturities of MBS and CMO may differ from contractual maturities because the mortgages underlying the securities may be called or prepaid without any penalties. Therefore, these securities are not included in the maturity categories in the following summary.
 Available For Sale
(in thousands)Amortized CostFair Value
Due in one year or less$42,982  $43,030  
Due after one year through five years185,876  186,530  
Due after five years through ten years225,762  227,898  
Due after ten years74,562  74,940  
$529,182  $532,398  
Mortgage-backed securities41,191  42,601  
Collateralized mortgage obligations301,287  306,860  
Total$871,660  $881,859