The following tables summarize the amortized cost and fair values of securities available-for-sale and securities held-to-maturity as of the dates shown and the corresponding amounts of gross unrealized gains and losses:

September 30, 2020	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale
U.S. Treasury Notes	$	25,456	$	495	$	—		$	25,951
U.S. Government agencies		104,253		814		(357	)		104,710
Obligations of states, municipalities, and political subdivisions		103,895		4,417		—			108,312
Residential mortgage-backed securities
Agency		807,798		16,594		(355	)		824,037
Non-agency		62,775		1,321		—			64,096
Commercial mortgage-backed securities
Agency		256,830		7,415		(513	)		263,732
Non-agency		11,215		428		—			11,643
Corporate securities		56,059		1,364		(215	)		57,208
Asset-backed securities		50,354		89		(921	)		49,522
Total	$	1,478,635	$	32,937	$	(2,361	)	$	1,509,211

December 31, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale
U.S. Treasury Notes	$	41,403	$	427	$	—		$	41,830
U.S. Government agencies		165,162		542		(754	)		164,950
Obligations of states, municipalities, and political subdivisions		92,806		2,075		(49	)		94,832
Residential mortgage-backed securities
Agency		490,427		2,163		(2,354	)		490,236
Non-agency		109,501		593		(272	)		109,822
Commercial mortgage-backed securities
Agency		159,650		1,092		(1,041	)		159,701
Non-agency		31,144		130		—			31,274
Corporate securities		48,796		571		(37	)		49,330
Asset-backed securities		44,515		—		(198	)		44,317
Total	$	1,183,404	$	7,593	$	(4,705	)	$	1,186,292

The Company did not classify securities as trading during the three or nine months ended September 30, 2020 or during 2019.

Gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2020 and December 31, 2019, are summarized as follows:

			Less than 12 Months					12 Months or Longer					Total
September 30, 2020	# of Securities		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available-for-sale
U.S. Government agencies		7	$	50,779	$	(357	)	$	—	$	—		$	50,779	$	(357	)
Obligations of states, municipalities and political subdivisions		1		126		—			—		—			126		—
Residential mortgage-backed securities
Agency		11		116,877		(349	)		503		(6	)		117,380		(355	)
Commercial mortgage-backed securities
Agency		7		59,474		(513	)		—		—			59,474		(513	)
Corporate securities		7		12,304		(215	)		—		—			12,304		(215	)
Asset-backed securities		8		19,239		(301	)		19,200		(620	)		38,439		(921	)
Total		41	$	258,799	$	(1,735	)	$	19,703	$	(626	)	$	278,502	$	(2,361	)

			Less than 12 Months					12 Months or Longer					Total
December 31, 2019	# of Securities		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available-for-sale
U.S. Government agencies		8	$	49,318	$	(662	)	$	20,283	$	(92	)	$	69,601	$	(754	)
Obligations of states, municipalities and political subdivisions		7		13,309		(45	)		1,419		(4	)		14,728		(49	)
Residential mortgage-backed securities
Agency		50		132,703		(666	)		193,363		(1,688	)		326,066		(2,354	)
Non-agency		9		36,902		(206	)		10,126		(66	)		47,028		(272	)
Commercial mortgage-backed securities
Agency		13		67,649		(563	)		32,678		(478	)		100,327		(1,041	)
Corporate securities		4		6,103		(37	)		—		—			6,103		(37	)
Asset-backed securities		8		37,738		(198	)		—		—			37,738		(198	)
Total		99	$	343,722	$	(2,377	)	$	257,869	$	(2,328	)	$	601,591	$	(4,705	)

Certain securities have fair values less than amortized cost and, therefore, contain unrealized losses. The Company evaluated the securities that had an unrealized loss for other than temporary impairment and determined all declines in value to be temporary. There were 41 securities available-for-sale with unrealized losses at September 30, 2020. There were no securities held-to-maturity with unrealized losses at September 30, 2020. The Company anticipates full recovery of amortized cost with respect to these securities by maturity, or sooner, in the event of a more favorable market interest rate environment. The Company does not intend to sell these securities and it is not more likely than not that the Company will be required to sell them before recovery of their amortized cost basis, which may be at maturity.

The proceeds from all sales of securities available-for-sale, and the associated gains and losses, for the three and nine months ended September 30, 2020 and 2019 are listed below:

	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Proceeds	$	35,092	$	32,509	$	80,509	$	92,103
Gross gains		1,037		225		2,494		1,274
Gross losses		—		47		82		123

There were $1.0 million and $2.4 million in net gains reclassified from accumulated other comprehensive income into earnings for the three and nine months ended September 30, 2020, respectively. There were $178,000 and $1.2 million in net gains reclassified from accumulated other comprehensive income into earnings for the three and nine months ended September 30, 2019, respectively.

Securities posted as collateral were $994.1 million and $552.4 million at September 30, 2020 and December 31, 2019, respectively, of which carrying amounts of $407.9 million and $301.1 million were pledged at September 30, 2020 and December 31, 2019, respectively. At September 30, 2020 and December 31, 2019, of those pledged, the carrying amounts of securities pledged as collateral for public fund deposits were $346.4 million and $240.4 million, respectively, and for customer repurchase agreements of $56.4 million and $55.7 million, respectively. At September 30, 2020 and December 31, 2019, there were no securities pledged for advances from the Federal Home Loan Bank. Other securities were pledged for derivative positions, letters of credit and for purposes required or permitted by law. At September 30, 2020 and December 31, 2019, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity.

At September 30, 2020, the amortized cost and fair value of debt securities are shown by contractual maturity. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.

	Amortized Cost		Fair Value
Available-for-sale
Due in one year or less	$	26,009	$	26,278
Due from one to five years		46,331		48,014
Due from five to ten years		163,361		166,150
Due after ten years		104,316		105,261
Mortgage-backed securities		1,138,618		1,163,508
Total	$	1,478,635	$	1,509,211
Held-to-maturity
Due in one year or less	$	502	$	505
Due from one to five years		3,898		4,084
Total	$	4,400	$	4,589