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SECURITIES (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule of Equity securities gains and losses [Table Text Block]

The following table represents a summary of the gains and losses recognized within non-interest income and non-interest expense within the consolidated statements of income that relate to equity securities for the periods indicated:

			Years Ended December 31
			2022						2021						2020
			(Dollars in thousands)
Net (losses) gains recognized during the period on equity securities			$	(3,061)					$	554					$	528
Less: net gains recognized during the period on equity securities sold during the period			—						192						14
Unrealized (losses) gains recognized during the reporting period on equity securities still held at the reporting date			$	(3,061)					$	362					$	514

Schedule of Available-for-sale Securities Reconciliation

The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) at the dates indicated:

			December 31, 2022																														December 31, 2021
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Allowance for credit losses						Fair Value						Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Allowance for credit losses						Fair Value
			(Dollars in thousands)
U.S. government agency securities			$	230,936					$	—					$	(28,636)					$	—					$	202,300					$	217,393					$	990					$	(2,901)					$	—					$	215,482
U.S. treasury securities			874,035						—						(82,694)						—						791,341						873,467						172						(12,191)						—						861,448
Agency mortgage-backed securities			359,068						54						(45,434)						—						313,688						364,955						4,512						(5,534)						—						363,933
Agency collateralized mortgage obligations			41,874						—						(3,031)						—						38,843						78,966						1,282						(571)						—						79,677
State, county, and municipal securities			193						—						(2)						—						191						192						11						—						—						203
Single issuer trust preferred securities issued by banks			—						—						—						—						—						489						2						—						—						491
Pooled trust preferred securities issued by banks and insurers			1,203						—						(169)						—						1,034						1,199						—						(199)						—						1,000
Small business administration pooled securities			59,470						—						(7,713)						—						51,757						47,075						1,839						—						—						48,914
Total available for sale securities			$	1,566,779					$	54					$	(167,679)					$	—					$	1,399,154					$	1,583,736					$	8,808					$	(21,396)					$	—					$	1,571,148

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following tables shows the gross unrealized losses and fair value of the Company’s available for sale securities in an unrealized loss position, and for which the Company has not recorded a provision for credit losses, as of the dates indicated. These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position:

									December 31, 2022
									Less than 12 months												12 months or longer												Total
			# of holdings						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
									(Dollars in thousands)
U.S. government agency securities			9						$	60,575					$	(7,292)					$	141,725					$	(21,344)					$	202,300					$	(28,636)
U.S. treasury securities			18						43,035						(6,350)						748,306						(76,344)						791,341						(82,694)
Agency mortgage-backed securities			123						155,944						(15,186)						154,653						(30,248)						310,597						(45,434)
Agency collateralized mortgage obligations			13						38,843						(3,031)						—						—						38,843						(3,031)
State, county, and municipal securities			1						191						(2)						—						—						191						(2)
Pooled trust preferred securities issued by banks and insurers			1						—						—						1,034						(169)						1,034						(169)
Small business administration pooled securities			8						34,511						(3,550)						17,246						(4,163)						51,757						(7,713)
Total impaired available for sale securities			173						$	333,099					$	(35,411)					$	1,062,964					$	(132,268)					$	1,396,063					$	(167,679)

									December 31, 2021
									Less than 12 months												12 months or longer												Total
			# of holdings						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
U.S. government agency securities			6						$	160,913					$	(2,901)					$	—					$	—					$	160,913					$	(2,901)
U.S. treasury securities			17						811,993						(12,191)						—						—						811,993						(12,191)
Agency mortgage-backed securities			12						214,678						(5,534)						—						—						214,678						(5,534)
Agency collateralized mortgage obligations			1						22,960						(571)						—						—						22,960						(571)
Pooled trust preferred securities issued by banks and insurers			1						—						—						1,000						(199)						1,000						(199)
Total impaired available for sale securities			37						$	1,210,544					$	(21,197)					$	1,000					$	(199)					$	1,211,544					$	(21,396)

Debt Securities, Held-to-maturity

The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses at the dates indicated:

			December 31, 2022																														December 31, 2021
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Allowance for credit losses						Fair Value						Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Allowance for credit losses						Fair Value
			(Dollars in thousands)
U.S. government agency securities			$	31,258					$	—					$	(2,222)					$	—					$	29,036					$	32,987					$	—					$	(441)					—						$	32,546
U.S. treasury securities			100,634						—						(11,755)						—						88,879						102,560						6						(324)						—						102,242
Agency mortgage-backed securities			898,927						408						(83,383)						—						815,952						493,012						8,495						(4,271)						—						497,236
Agency collateralized mortgage obligations			535,971						—						(77,554)						—						458,417						415,736						3,232						(10,123)						—						408,845
Single issuer trust preferred securities issued by banks			1,500						8						—						—						1,508						1,500						8						—						—						1,508
Small business administration pooled securities			136,830						313						(6,225)						—						130,918						21,023						733						—						—						21,756
Total held to maturity securities			$	1,705,120					$	729					$	(181,139)					$	—					$	1,524,710					$	1,066,818					$	12,474					$	(15,159)					$	—					$	1,064,133

Schedule of Contractual Maturities of Securities

A schedule of the contractual maturities of securities available for sale and securities held to maturity at December 31, 2022 is presented below:

			Due in one year or less												Due after one year to five years												Due after five to ten years												Due after ten years												Total
			Amortized Cost						Fair Value						Amortized Cost						Fair Value						Amortized Cost						Fair Value						Amortized Cost						Fair Value						Amortized Cost						Fair Value
			(Dollars in thousands)
Available for sale securities
U.S. government agency securities			$	—					$	—					$	117,591					$	104,486					$	113,345					$	97,814					$	—					$	—					$	230,936					$	202,300
U.S. treasury securities			49,958						48,237						690,626						627,111						133,451						115,993						—						—						874,035						791,341
Agency mortgage-backed securities			14,800						14,571						72,240						66,658						124,370						105,203						147,658						127,256						359,068						313,688
Agency collateralized mortgage obligations			—						—						—						—						—						—						41,874						38,843						41,874						38,843
State, county, and municipal securities			—						—						193						191						—						—						—						—						193						191
Pooled trust preferred securities issued by banks and insurers			—						—						—						—						—						—						1,203						1,034						1,203						1,034
Small business administration pooled securities			—						—						—						—						—						—						59,470						51,757						59,470						51,757
Total available for sale securities			$	64,758					$	62,808					$	880,650					$	798,446					$	371,166					$	319,010					$	250,205					$	218,890					$	1,566,779					$	1,399,154
Held to maturity securities
U.S. government agency securities			$	—					$	—					$	31,258					$	29,036					$	—					$	—					$	—					$	—					$	31,258					$	29,036
U.S. Treasury securities			—						—						49,779						44,519						50,855						44,360						—						—						100,634						88,879
Agency mortgage-backed securities			152						150						215,269						203,018						450,182						395,627						233,324						217,157						898,927						815,952
Agency collateralized mortgage obligations			—						—						29,836						28,381						36,576						31,802						469,559						398,234						535,971						458,417
Single issuer trust preferred securities issued by banks			—						—						—						—						1,500						1,508						—						—						1,500						1,508
Small business administration pooled securities			—						—						—						—						3,388						3,088						133,442						127,830						136,830						130,918
Total held to maturity securities			$	152					$	150					$	326,142					$	304,954					$	542,501					$	476,385					$	836,325					$	743,221					$	1,705,120					$	1,524,710
Total			$	64,910					$	62,958					$	1,206,792					$	1,103,400					$	913,667					$	795,395					$	1,086,530					$	962,111					$	3,271,899					$	2,923,864

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Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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