SECURITIES (Tables)

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Available for Sale Securities

The amortized cost, gross unrealized gains and losses, and estimated fair values of debt securities available for sale and equity securities with a readily determinable fair value that are carried at fair value as of June 30, 2019, and December 31, 2018, are summarized in the table below, in thousands:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
June 30, 2019
U.S. government corporations and agencies	$	18,660	$	48	$	(87	)	$	18,621
Mortgage and asset-backed securities	2,191,327		17,472		(15,473		)	2,193,326
Obligations of states and political subdivisions	324,070		8,097		(384		)	331,783
Total debt securities	2,534,057		25,617		(15,944		)	2,543,730
Equity securities with a readily determinable fair value	18,157		—		—			18,157
Total	$	2,552,214	$	25,617	$	(15,944	)	$	2,561,887
December 31, 2018
U.S. government corporations and agencies	$	32,075	$	3	$	(127	)	$	31,951
Mortgage and asset-backed securities	2,061,358		3,740		(38,400		)	2,026,698
Obligations of states and political subdivisions	382,101		919		(8,046		)	374,974
Total debt securities	2,475,534		4,662		(46,573		)	2,433,623
Equity securities with a readily determinable fair value	17,086		—		—			17,086
Total	$	2,492,620	$	4,662	$	(46,573	)	$	2,450,709

Schedule of Held to Maturity Securities

The amortized cost, gross unrealized gains and losses and estimated fair values of held to maturity securities as of June 30, 2019, and December 31, 2018, are summarized in the table below, in thousands:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
June 30, 2019
Obligations of states and political subdivisions	$	88,166	$	8,453	$	—		$	96,619
Total	$	88,166	$	8,453	$	—		$	96,619
December 31, 2018
Obligations of states and political subdivisions	$	236,283	$	9,554	$	(496	)	$	245,341
Total	$	236,283	$	9,554	$	(496	)	$	245,341

Investments Classified by Contractual Maturity Date

The amortized cost and estimated fair value of investment securities carried at fair value at June 30, 2019, by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties.

	June 30, 2019
	Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	24,891	$	24,889
Due in 1 to 5 years	45,463		45,685
Due in 5 to 10 years	72,708		74,659
Due after 10 years	199,668		205,171
Total debt securities	342,730		350,404
Mortgage and asset-backed securities	2,191,327		2,193,326
Equity securities with a readily determinable fair value	18,157		18,157
Total investment securities	$	2,552,214	$	2,561,887

The amortized cost and estimated fair value of debt securities held to maturity at June 30, 2019, by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties.

	June 30, 2019
	Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	1,531	$	1,567
Due in 1 to 5 years	11,634		11,863
Due in 5 to 10 years	58,200		61,679
Due after 10 years	16,801		21,510
Total investment securities	$	88,166	$	96,619

Schedule of Realized Gross Gains (Losses)

Gross gains and losses realized related to the sales of securities carried at fair value for the three- and six-month periods ended June 30, 2019 and 2018, are summarized as follows, in thousands:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Proceeds from sales	$	760,743	$	243,489	$	1,194,897	$	635,735
Gross security gains	5,522		457		7,930		3,470
Gross security losses	1,942		716		2,775		2,288

Schedule of Debt Securities Available-for-sale

The following tables summarize, in thousands, the amount of unrealized losses, defined as the amount by which cost or amortized cost exceeds fair value, and the related fair value of investments with unrealized losses in Heartland's securities portfolio as of June 30, 2019, and December 31, 2018. The investments were segregated into two categories: those that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or more. The reference point for determining how long an investment was in an unrealized loss position was June 30, 2018, and December 31, 2017, respectively. Securities for which Heartland has taken credit-related other-than-temporary impairment ("OTTI") write-downs are categorized as being "less than 12 months" or "12 months or longer" in a continuous loss position based on the point in time that the fair value declined to below the cost basis and not the period of time since the credit-related OTTI write-down.

Debt securities available for sale	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
June 30, 2019
U.S. government corporations and agencies	$	4,631	$	(87	)	$	—	$	—		$	4,631	$	(87	)
Mortgage and asset-backed securities	544,795		(5,265		)	448,159		(10,208		)	992,954		(15,473		)
Obligations of states and political subdivisions	10,975		(11		)	48,748		(373		)	59,723		(384		)
Total temporarily impaired securities	$	560,401	$	(5,363	)	$	496,907	$	(10,581	)	$	1,057,308	$	(15,944	)
December 31, 2018
U.S. government corporations and agencies	$	24,902	$	(83	)	$	4,577	$	(44	)	$	29,479	$	(127	)
Mortgage and asset-backed securities	733,826		(9,060		)	805,089		(29,340		)	1,538,915		(38,400		)
Obligations of states and political subdivisions	34,990		(390		)	258,143		(7,656		)	293,133		(8,046		)
Total temporarily impaired securities	$	793,718	$	(9,533	)	$	1,067,809	$	(37,040	)	$	1,861,527	$	(46,573	)

Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value

Securities held to maturity	Less than 12 months					12 months or longer					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
June 30, 2019
Obligations of states and political subdivisions	$	—	$	—		$	—	$	—		$	—	$	—
Total temporarily impaired securities	$	—	$	—		$	—	$	—		$	—	$	—
December 31, 2018
Obligations of states and political subdivisions	$	10,802	$	(17	)	$	19,508	$	(479	)	$	30,310	$	(496	)
Total temporarily impaired securities	$	10,802	$	(17	)	$	19,508	$	(479	)	$	30,310	$	(496	)