AFS Securities (Tables)

9 Months Ended

Sep. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Amortized cost and fair value of available-for-sale securities

The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows at:



	September 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
States and political subdivisions	$	170,897	$	4,679	$	1	$	175,575
Auction rate money market preferred	3,200		—		111		3,089
Mortgage-backed securities	149,843		975		698		150,120
Collateralized mortgage obligations	115,452		1,501		208		116,745
Total	$	439,392	$	7,155	$	1,018	$	445,529



	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Government sponsored enterprises	$	172	$	—	$	2	$	170
States and political subdivisions	188,992		2,125		251		190,866
Auction rate money market preferred	3,200		—		646		2,554
Mortgage-backed securities	189,688		76		5,280		184,484
Collateralized mortgage obligations	119,193		71		2,504		116,760
Total	$	501,245	$	2,272	$	8,683	$	494,834

Amortized cost and fair value of available-for-sale securities by contractual maturity

The amortized cost and fair value of AFS securities by contractual maturity at September 30, 2019 are as follows:



	Maturing								Securities with Variable Monthly Payments or Noncontractual Maturities
	Due in One Year or Less		After One Year But Within Five Years		After Five Years But Within Ten Years		After Ten Years				Total
States and political subdivisions	$	29,273	$	70,436	$	44,018	$	27,170	$	—	$	170,897
Auction rate money market preferred	—		—		—		—		3,200		3,200
Mortgage-backed securities	—		—		—		—		149,843		149,843
Collateralized mortgage obligations	—		—		—		—		115,452		115,452
Total amortized cost	$	29,273	$	70,436	$	44,018	$	27,170	$	268,495	$	439,392
Fair value	$	29,378	$	71,963	$	45,538	$	28,696	$	269,954	$	445,529

Schedule of Realized Gain (Loss) [Table Text Block]

A summary of the sales activity of AFS securities was as follows for the:



	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Proceeds from sales of AFS securities	$	33,840	$	—	$	33,840	$	—
Gross realized gains (losses)	$	6	$	—	$	6	$	—
Applicable income tax expense (benefit)	$	1	$	—	$	1	$	—

Available-for-sale securities with gross unrealized losses

The following information pertains to AFS securities with gross unrealized losses at September 30, 2019 and December 31, 2018, aggregated by investment category and length of time that individual securities have been in a continuous loss position.



	September 30, 2019
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
States and political subdivisions	$	1	$	797	$	—	$	—	$	1
Auction rate money market preferred	—		—		111		3,089		111
Mortgage-backed securities	4		5,943		694		66,703		698
Collateralized mortgage obligations	47		11,312		161		17,043		208
Total	$	52	$	18,052	$	966	$	86,835	$	1,018
Number of securities in an unrealized loss position:			10				23		33



	December 31, 2018
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
Government sponsored enterprises	$	—	$	—	$	2	$	170	$	2
States and political subdivisions	83		14,732		168		15,090		251
Auction rate money market preferred	—		—		646		2,554		646
Mortgage-backed securities	896		43,485		4,384		124,253		5,280
Collateralized mortgage obligations	199		21,886		2,305		87,929		2,504
Total	$	1,178	$	80,103	$	7,505	$	229,996	$	8,683
Number of securities in an unrealized loss position:			66				102		168