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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2023
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
202320222021
(Dollars in thousands)
Net gains (losses) recognized during the period on equity securities$1,180 $(3,061)$554 
Less: net gains recognized during the period on equity securities sold during the period197 — 192 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$983 $(3,061)$362 
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, 2023December 31, 2022
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. government agency securities$230,198 $— $(23,060)$— $207,138 $230,936 $— $(28,636)$— $202,300 
U.S. treasury securities824,597 — (55,495)— 769,102 874,035 — (82,694)— 791,341 
Agency mortgage-backed securities314,269 24 (37,246)— 277,047 359,068 54 (45,434)— 313,688 
Agency collateralized mortgage obligations35,713 6 (2,530)— 33,189 41,874 — (3,031)— 38,843 
State, county, and municipal securities195 — (5)— 190 193 — (2)— 191 
Pooled trust preferred securities issued by banks and insurers 1,188 — (170)— 1,018 1,203 — (169)— 1,034 
Small business administration pooled securities53,702 — (7,130)— 46,572 59,470 — (7,713)— 51,757 
Total available for sale securities$1,459,862 $30 $(125,636)$— $1,334,256 $1,566,779 $54 $(167,679)$— $1,399,154 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The following tables show the gross unrealized losses and fair value of the Company’s available for sale securities in an unrealized loss position 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, 2023
  Less than 12 months12 months or longerTotal
# of
holdings		Fair ValueUnrealized
Losses		Fair
Value		Unrealized
Losses		Fair ValueUnrealized
Losses
  (Dollars in thousands)
U.S. government agency securities9 $— $— $207,138 $(23,060)$207,138 $(23,060)
U.S. treasury securities17 — — 769,102 (55,495)769,102 (55,495)
Agency mortgage-backed securities115 1,091 (11)273,447 (37,235)274,538 (37,246)
Agency collateralized mortgage obligations12 339 (2)31,682 (2,528)32,021 (2,530)
State, county, and municipal securities1 190 (5)— — 190 (5)
Pooled trust preferred securities issued by banks and insurers1 — — 1,018 (170)1,018 (170)
Small business administration pooled securities8 — — 46,572 (7,130)46,572 (7,130)
Total impaired available for sale securities163 $1,620 $(18)$1,328,959 $(125,618)$1,330,579 $(125,636)

December 31, 2022
Less than 12 months12 months or longerTotal
# of
holdings		Fair ValueUnrealized
Losses		Fair
Value		Unrealized
Losses		Fair ValueUnrealized
Losses
U.S. government agency securities9 $60,575 $(7,292)$141,725 $(21,344)$202,300 $(28,636)
U.S. treasury securities18 43,035 (6,350)748,306 (76,344)791,341 (82,694)
Agency mortgage-backed securities123 155,944 (15,186)154,653 (30,248)310,597 (45,434)
Agency collateralized mortgage obligations13 38,843 (3,031)— — 38,843 (3,031)
State, county, and municipal securities1 191 (2)— — 191 (2)
Pooled trust preferred securities issued by banks and insurers1 — — 1,034 (169)1,034 (169)
Small business administration pooled securities8 34,511 (3,550)17,246 (4,163)51,757 (7,713)
Total impaired available for sale securities173 $333,099 $(35,411)$1,062,964 $(132,268)$1,396,063 $(167,679)
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, 2023December 31, 2022
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. government agency securities$29,521 $— $(1,113)$— $28,408 $31,258 $— $(2,222)— $29,036 
U.S. treasury securities100,712 — (9,177)— 91,535 100,634 — (11,755)— 88,879 
Agency mortgage-backed securities829,431 175 (65,878)— 763,728 898,927 408 (83,383)— 815,952 
Agency collateralized mortgage obligations477,517 — (69,606)— 407,911 535,971 — (77,554)— 458,417 
Single issuer trust preferred securities issued by banks1,500 — (127)— 1,373 1,500 8 — — 1,508 
Small business administration pooled securities130,426 384 (6,157)— 124,653 136,830 313 (6,225)— 130,918 
Total held to maturity securities$1,569,107 $559 $(152,058)$— $1,417,608 $1,705,120 $729 $(181,139)$— $1,524,710 
Schedule of Contractual Maturities of Securities A schedule of the contractual maturities of securities available for sale and securities held to maturity at December 31, 2023 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $199,371 $179,973 $30,827 $27,165 $— $— $230,198 $207,138 
U.S. treasury securities197,553 193,192 627,044 575,910 — — — — 824,597 769,102 
Agency mortgage-backed securities3 3 141,212 126,484 40,183 34,939 132,871 115,621 314,269 277,047 
Agency collateralized mortgage obligations— — — — 2,923 2,680 32,790 30,509 35,713 33,189 
State, county, and municipal securities— — 195 190 — — — — 195 190 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,188 1,018 1,188 1,018 
Small business administration pooled securities— — — — — — 53,702 46,572 53,702 46,572 
Total available for sale securities$197,556 $193,195 $967,822 $882,557 $73,933 $64,784 $220,551 $193,720 $1,459,862 $1,334,256 
Held to maturity securities
U.S. government agency securities$29,521 $28,408 $— $— $— $— $— $— $29,521 $28,408 
U.S. Treasury securities— — 99,720 90,703 992 832 — — 100,712 91,535 
Agency mortgage-backed securities— — 411,746 383,514 222,825 198,122 194,860 182,092 829,431 763,728 
Agency collateralized mortgage obligations— — 63,596 58,934 20,210 17,864 393,711 331,113 477,517 407,911 
Single issuer trust preferred securities issued by banks— — 1,500 1,373 — — — — 1,500 1,373 
Small business administration pooled securities— — — — 5,742 5,272 124,684 119,381 130,426 124,653 
Total held to maturity securities$29,521 $28,408 $576,562 $534,524 $249,769 $222,090 $713,255 $632,586 $1,569,107 $1,417,608 
Total$227,077 $221,603 $1,544,384 $1,417,081 $323,702 $286,874 $933,806 $826,306 $3,028,969 $2,751,864