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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2024
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
202420232022
(Dollars in thousands)
Net gains (losses) recognized during the period on equity securities$423 $1,180 $(3,061)
Less: net gains recognized during the period on equity securities sold during the period877 197 — 
Unrealized (losses) gains recognized during the reporting period on equity securities still held at the reporting date$(454)$983 $(3,061)
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, 2024December 31, 2023
 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$229,452 $— $(19,792)$— $209,660 $230,198 $— $(23,060)$— $207,138 
U.S. treasury securities628,017 — (36,016)— 592,001 824,597 — (55,495)— 769,102 
Agency mortgage-backed securities415,918 25 (37,782)— 378,161 314,269 24 (37,246)— 277,047 
Agency collateralized mortgage obligations31,168 1 (2,174)— 28,995 35,713 6 (2,530)— 33,189 
State, county, and municipal securities197 — (3)— 194 195 — (5)— 190 
Pooled trust preferred securities issued by banks and insurers 1,180 — (85)— 1,095 1,188 — (170)— 1,018 
Small business administration pooled securities48,032 — (7,194)— 40,838 53,702 — (7,130)— 46,572 
Total available for sale securities$1,353,964 $26 $(103,046)$— $1,250,944 $1,459,862 $30 $(125,636)$— $1,334,256 
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, 2024
  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 $— $— $209,660 $(19,792)$209,660 $(19,792)
U.S. treasury securities13 — — 592,001 (36,016)592,001 (36,016)
Agency mortgage-backed securities117 127,152 (2,867)249,098 (34,915)376,250 (37,782)
Agency collateralized mortgage obligations11 1,153 (4)26,890 (2,170)28,043 (2,174)
State, county, and municipal securities1 194 (3)— — 194 (3)
Pooled trust preferred securities issued by banks and insurers1 — — 1,095 (85)1,095 (85)
Small business administration pooled securities8 — — 40,838 (7,194)40,838 (7,194)
Total impaired available for sale securities160 $128,499 $(2,874)$1,119,582 $(100,172)$1,248,081 $(103,046)

December 31, 2023
Less than 12 months12 months or longerTotal
# of
holdings		Fair ValueUnrealized
Losses		Fair
Value		Unrealized
Losses		Fair ValueUnrealized
Losses
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)
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, 2024December 31, 2023
 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 
U.S. treasury securities100,791 — (7,769)— 93,022 100,712 — (9,177)— 91,535 
Agency mortgage-backed securities788,470 90 (62,198)— 726,362 829,431 175 (65,878)— 763,728 
Agency collateralized mortgage obligations422,827 — (65,143)— 357,684 477,517 — (69,606)— 407,911 
Single issuer trust preferred securities issued by banks— — — — — 1,500 — (127)— 1,373 
Small business administration pooled securities122,868 — (8,135)— 114,733 130,426 384 (6,157)— 124,653 
Total held to maturity securities$1,434,956 $90 $(143,245)$— $1,291,801 $1,569,107 $559 $(152,058)$— $1,417,608 
Schedule of Contractual Maturities of Securities A schedule of the contractual maturities of securities available for sale and securities held to maturity at December 31, 2024 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $229,452 $209,660 $— $— $— $— $229,452 $209,660 
U.S. treasury securities149,764 147,143 478,253 444,858 — — — — 628,017 592,001 
Agency mortgage-backed securities51 50 185,404 173,011 46,225 40,726 184,238 164,374 415,918 378,161 
Agency collateralized mortgage obligations— — — — 2,508 2,314 28,660 26,681 31,168 28,995 
State, county, and municipal securities— — 197 194 — — — — 197 194 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,180 1,095 1,180 1,095 
Small business administration pooled securities— — — — — — 48,032 40,838 48,032 40,838 
Total available for sale securities$149,815 $147,193 $893,306 $827,723 $48,733 $43,040 $262,110 $232,988 $1,353,964 $1,250,944 
Held to maturity securities
U.S. Treasury securities$— $— $99,798 $92,205 $993 $817 $— $— $100,791 $93,022 
Agency mortgage-backed securities81 80 463,524 435,908 163,379 143,000 161,486 147,374 788,470 726,362 
Agency collateralized mortgage obligations— — 61,215 57,331 16,776 14,963 344,836 285,390 422,827 357,684 
Small business administration pooled securities— — — — 6,555 6,043 116,313 108,690 122,868 114,733 
Total held to maturity securities$81 $80 $624,537 $585,444 $187,703 $164,823 $622,635 $541,454 $1,434,956 $1,291,801 
Total$149,896 $147,273 $1,517,843 $1,413,167 $236,436 $207,863 $884,745 $774,442 $2,788,920 $2,542,745