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INVESTMENT SECURITIES (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

The following tables detail the amortized cost, allowance for credit losses and the estimated fair value of the Company's investments in available-for-sale and held-to-maturity debt securities. None of the Company's investments in debt securities are classified as trading.


	December 31, 2022
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Allowance for Credit Losses		Fair Value
Available-for-Sale Debt Securities
Collateralized mortgage obligation (CMO)	$	608,834	$	—	$	102,454	$	—	$	506,380
Fannie Mae (FNMA) mortgage-backed securities (MBS)	3,823,036		—		572,778		—		3,250,258
Freddie Mac (FHLMC) MBS	135,554		—		13,555		—		121,999
Ginnie Mae (GNMA) MBS	39,116		—		2,978		—		36,138
Government-sponsored enterprises (GSE) agency notes	228,010		—		49,725		—		178,285
	$	4,834,550	$	—	$	741,490	$	—	$	4,093,060
Held-to-Maturity Debt Securities(1)
FNMA MBS	$	909,498	$	—	$	68,677	$	—	$	840,821
State and political subdivisions	201,631		532		3,372		10		198,781
Foreign bonds	500		2		—		—		502
	$	1,111,629	$	534	$	72,049	$	10	$	1,040,104

(1)Held-to-maturity securities transferred from available-for-sale are included in held-to-maturity at amortized cost basis at the time of transfer. The amortized cost of transferred held-to-maturity securities included net unrealized losses of $142.8 million at December 31, 2022, which are offset in Accumulated other comprehensive income (loss). At the time of transfer, there was no allowance for credit loss on the available-for-sale securities. Subsequent to transfer, the securities were evaluated for credit loss.


	December 31, 2021
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Allowance for Credit Losses		Fair Value
Available-for-Sale Debt Securities
CMO	$	586,830	$	3,569	$	14,633	$	—	$	575,766
FNMA MBS	4,275,307		24,170		53,793		—		4,245,684
FHLMC MBS	139,708		6,336		516		—		145,528
GNMA MBS	17,456		551		71		—		17,936
GSE agency notes	230,581		—		10,184		—		220,397
	$	5,249,882	$	34,626	$	79,197	$	—	$	5,205,311
Held-to-Maturity Debt Securities(1)
State and political subdivisions	$	90,146	$	3,489	$	—	$	4	$	93,631
Foreign bonds	500		—		—		—		500
	$	90,646	$	3,489	$	—	$	4	$	94,131

(1)Held-to–maturity securities transferred from available-for-sale are included in held-to-maturity at fair value at the time of transfer. The amortized cost of transferred held-to-maturity securities included net unrealized gains of $0.2 million at December 31, 2021, which are offset in Accumulated other comprehensive income (loss). At the time of transfer, there was no allowance for credit loss on the available-for-sale securities. Subsequent to transfer, the securities were evaluated for credit loss.

Debt Securities, Held-to-Maturity


	December 31, 2022
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Allowance for Credit Losses		Fair Value
Available-for-Sale Debt Securities
Collateralized mortgage obligation (CMO)	$	608,834	$	—	$	102,454	$	—	$	506,380
Fannie Mae (FNMA) mortgage-backed securities (MBS)	3,823,036		—		572,778		—		3,250,258
Freddie Mac (FHLMC) MBS	135,554		—		13,555		—		121,999
Ginnie Mae (GNMA) MBS	39,116		—		2,978		—		36,138
Government-sponsored enterprises (GSE) agency notes	228,010		—		49,725		—		178,285
	$	4,834,550	$	—	$	741,490	$	—	$	4,093,060
Held-to-Maturity Debt Securities(1)
FNMA MBS	$	909,498	$	—	$	68,677	$	—	$	840,821
State and political subdivisions	201,631		532		3,372		10		198,781
Foreign bonds	500		2		—		—		502
	$	1,111,629	$	534	$	72,049	$	10	$	1,040,104


	December 31, 2021
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Allowance for Credit Losses		Fair Value
Available-for-Sale Debt Securities
CMO	$	586,830	$	3,569	$	14,633	$	—	$	575,766
FNMA MBS	4,275,307		24,170		53,793		—		4,245,684
FHLMC MBS	139,708		6,336		516		—		145,528
GNMA MBS	17,456		551		71		—		17,936
GSE agency notes	230,581		—		10,184		—		220,397
	$	5,249,882	$	34,626	$	79,197	$	—	$	5,205,311
Held-to-Maturity Debt Securities(1)
State and political subdivisions	$	90,146	$	3,489	$	—	$	4	$	93,631
Foreign bonds	500		—		—		—		500
	$	90,646	$	3,489	$	—	$	4	$	94,131

The following table presents the activity in the allowance for credit losses for state and political subdivisions debt securities for the twelve months ended December 31, 2022 and 2021:


	Twelve months ended December 31,
(Dollars in thousands)	2022		2021

Allowance for credit losses:
Beginning balance	$	4		$	6

Provision for credit losses	6			(2)



Ending balance	$	10		$	4

Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity

The scheduled maturities of available-for-sale debt securities at December 31, 2022 and December 31, 2021 are presented in the table below:


	Available-for-Sale
(Dollars in thousands)	Amortized Cost		Fair Value
December 31, 2022 (1)
Within one year	$	—	$	—
After one year but within five years	83,014		77,499
After five years but within ten years	465,777		398,607
After ten years	4,285,759		3,616,954
	$	4,834,550	$	4,093,060
December 31, 2021 (1)
Within one year	$	—	$	—
After one year but within five years	103,960		107,009
After five years but within ten years	204,186		204,289
After ten years	4,941,736		4,894,013
	$	5,249,882	$	5,205,311

(1)Actual maturities could differ from contractual maturities.

The scheduled maturities of held-to-maturity debt securities at December 31, 2022 and December 31, 2021 are presented in the table below:


	Held-to-Maturity
(Dollars in thousands)	Amortized Cost		Fair Value
December 31, 2022 (1)
Within one year	$	731	$	732
After one year but within five years	9,530		9,476
After five years but within ten years	46,170		45,944
After ten years	1,055,198		983,952
	$	1,111,629	$	1,040,104
December 31, 2021 (1)
Within one year	$	232	$	234
After one year but within five years	2,675		2,736
After five years but within ten years	44,137		45,404
After ten years	43,602		45,757
	$	90,646	$	94,131

(1)Actual maturities could differ from contractual maturities.

Schedule of Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category

For debt securities in an unrealized loss position and an allowance has not been recorded, the table below shows the gross unrealized losses and fair value by investment category and length of time that individual debt securities were in a continuous unrealized loss position at December 31, 2022.


	Duration of Unrealized Loss Position
	Less than 12 months				12 months or longer				Total
(Dollars in thousands)	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available-for-sale debt securities:
CMO	$	158,449	$	13,855	$	347,931	$	88,599	$	506,380	$	102,454
FNMA MBS	1,237,560		145,752		2,012,698		427,026		3,250,258		572,778
FHLMC MBS	102,321		9,268		19,671		4,287		121,992		13,555
GNMA MBS	32,076		2,265		4,030		713		36,106		2,978
GSE agency notes	—		—		178,285		49,725		178,285		49,725
	$	1,530,406	$	171,140	$	2,562,615	$	570,350	$	4,093,021	$	741,490


	Duration of Unrealized Loss Position
	Less than 12 months				12 months or longer				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(Dollars in thousands)	Value		Loss		Value		Loss		Value		Loss
Available-for-sale debt securities:
CMO	$	411,347	$	12,730	$	35,638	$	1,903	$	446,985	$	14,633
FNMA MBS	3,018,606		41,021		356,665		12,772		3,375,271		53,793
FHLMC MBS	11,227		348		1,917		168		13,144		516
GNMA MBS	4,847		71		—		—		4,847		71
GSE agency notes	64,509		1,918		155,888		8,266		220,397		10,184
	$	3,510,536	$	56,088	$	550,108	$	23,109	$	4,060,644	$	79,197

Held-to-maturity, Credit Quality Indicator

The following table summarizes the amortized cost of debt securities held-to-maturity as of December 31, 2022, aggregated by credit quality indicator:


(Dollars in thousands)	FNMA MBS		State and political subdivisions		Foreign bonds
A+ rated or higher	$	—	$	201,631	$	500
Not rated	909,498		—		—
Ending balance	$	909,498	$	201,631	$	500

The following table summarizes the amortized cost of debt securities held-to-maturity as of December 31, 2021, aggregated by credit quality indicator:


(Dollars in thousands)	State and political subdivisions		Foreign bonds
A+ rated or higher	$	90,146	$	500
Not rated	—		—
Ending balance	$	90,146	$	500