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Securities (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Fair Value of Securities
The fair value of securities is as follows:
September 30, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available for sale
U.S. Treasury and federal agencies$6,250 $— $(11)$6,239 
State and municipal651,256 27,978 (775)678,459 
Federal agency collateralized mortgage obligations180,628 5,222 (1)185,849 
Federal agency mortgage-backed pools127,802 4,670 — 132,472 
Corporate notes10,877 1,447 — 12,324 
Total available for sale investment securities$976,813 $39,317 $(787)$1,015,343 
Held to maturity
State and municipal$165,858 $10,919 $— $176,777 
Federal agency collateralized mortgage obligations2,839 67 — 2,906 
Federal agency mortgage-backed pools11,573 356 — 11,929 
Total held to maturity investment securities$180,270 $11,342 $— $191,612 

December 31, 2019
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available for sale
U.S. Treasury and federal agencies$1,415 $— $(2)$1,413 
State and municipal396,931 11,288 (2,451)405,768 
Federal agency collateralized mortgage obligations267,272 2,543 (563)269,252 
Federal agency mortgage-backed pools145,623 1,207 (258)146,572 
Corporate notes10,848 923 — 11,771 
Total available for sale investment securities$822,089 $15,961 $(3,274)$834,776 
Held to maturity
State and municipal$190,767 $7,129 $(54)$197,842 
Federal agency collateralized mortgage obligations4,560 13 (5)4,568 
Federal agency mortgage-backed pools12,572 194 (29)12,737 
Total held to maturity investment securities$207,899 $7,336 $(88)$215,147 
Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity
The amortized cost and fair value of securities available for sale and held to maturity at September 30, 2020 and December 31, 2019, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
September 30, 2020December 31, 2019
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Available for sale
Within one year$49,129 $49,088 $37,386 $37,321 
One to five years49,766 51,201 41,230 41,293 
Five to ten years112,483 121,648 117,004 122,145 
After ten years457,005 475,085 213,574 218,193 
668,383 697,022 409,194 418,952 
Federal agency collateralized mortgage obligations180,628 185,849 267,272 269,252 
Federal agency mortgage–backed pools127,802 132,472 145,623 146,572 
Total available for sale investment securities$976,813 $1,015,343 $822,089 $834,776 
Held to maturity
Within one year$8,205 $8,245 $7,811 $7,874 
One to five years46,090 47,750 56,037 57,048 
Five to ten years85,339 91,579 94,756 98,480 
After ten years26,224 29,203 32,163 34,440 
165,858 176,777 190,767 197,842 
Federal agency collateralized mortgage obligations2,839 2,906 4,560 4,568 
Federal agency mortgage–backed pools11,573 11,929 12,572 12,737 
Total held to maturity investment securities$180,270 $191,612 $207,899 $215,147 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The following table shows the gross unrealized losses and the 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.
September 30, 2020
Less than 12 Months12 Months or MoreTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Investment Securities
U.S. Treasury and federal agencies$5,239 $(11)$— $— $5,239 $(11)
State and municipal105,976 (733)1,307 (42)107,283 (775)
Federal agency collateralized mortgage obligations600 (1)— — 600 (1)
Total temporarily impaired securities$111,815 $(745)$1,307 $(42)$113,122 $(787)
December 31, 2019
Less than 12 Months12 Months or MoreTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Investment Securities
U.S. Treasury and federal agencies$1,413 $(2)$— $— $1,413 $(2)
State and municipal129,942 (2,374)6,279 (131)136,221 (2,505)
Federal agency collateralized mortgage obligations68,043 (308)23,301 (260)91,344 (568)
Federal agency mortgage–backed pools24,740 (104)37,822 (183)62,562 (287)
Total temporarily impaired securities$224,138 $(2,788)$67,402 $(574)$291,540 $(3,362)
Sales of Securities Available for Sale
Information regarding security proceeds, gross gains and gross losses are presented below.
Three Months EndedNine Months Ended
September 30September 30
2020201920202019
Sales of securities available for sale
Proceeds$17,012 $— $54,194 $91,635 
Gross gains1,094 — 1,731 158 
Gross losses(6)— (56)(243)