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Securities (Tables)
 6 Months Ended
Jun. 30, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedSix Months Ended
June 30June 30
2026202520262025
Dollars in thousands
Net gains recognized during the period on equity securities$173 $71 $198 $169 
Less: net gains recognized during the period on equity securities sold during the period347 — 347 6 
Unrealized (losses) gains recognized during the reporting period on equity securities still held at the reporting date$(174)$71 $(149)$163 
Debt Securities, Available-for-sale [Table Text Block]
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:
June 30, 2026December 31, 2025
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$228,317 $— $(9,529)$— $218,788 $228,697 $— $(10,025)$— $218,672 
U.S. treasury securities390,700 — (11,525)— 379,175 485,388 32 (14,336)— 471,084 
Agency mortgage-backed securities996,262 746 (35,199)— 961,809 790,764 4,430 (22,231)— 772,963 
Agency collateralized mortgage obligations261,338 126 (9,935)— 251,529 273,321 784 (4,529)— 269,576 
Municipal securities229,525 488 (1,212)— 228,801 230,052 3,056 (30)— 233,078 
Pooled trust preferred securities issued by banks and insurers 1,035 — (69)— 966 1,120 — (78)— 1,042 
Small business administration pooled securities39,746 — (4,842)— 34,904 42,480 — (4,648)— 37,832 
Total available for sale securities$2,146,923 $1,360 $(72,311)$— $2,075,972 $2,051,822 $8,302 $(55,877)$— $2,004,247 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] 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:
June 30, 2026
Less than 12 months12 months or longerTotal
# of 
holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
(Dollars in thousands)
U.S. government agency securities9 $— $— $218,788 $(9,529)$218,788 $(9,529)
U.S. treasury securities9 6,564 (59)372,611 (11,466)379,175 (11,525)
Agency mortgage-backed securities129 637,880 (13,484)228,825 (21,715)866,705 (35,199)
Agency collateralized mortgage obligations86 224,470 (8,530)21,257 (1,405)245,727 (9,935)
Municipal securities174 170,097 (1,212)— — 170,097 (1,212)
Pooled trust preferred securities issued by banks and insurers1 — — 966 (69)966 (69)
Small business administration pooled securities8 — — 34,904 (4,842)34,904 (4,842)
Total 416 $1,039,011 $(23,285)$877,351 $(49,026)$1,916,362 $(72,311)
December 31, 2025
Less than 12 months12 months or longerTotal
# of 
holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
(Dollars in thousands)
U.S. government agency securities9 $— $— $218,672 $(10,025)$218,672 $(10,025)
U.S. treasury securities10 — — 464,514 (14,336)464,514 (14,336)
Agency mortgage-backed securities106 178,837 (911)237,923 (21,320)416,760 (22,231)
Agency collateralized mortgage obligations54 175,697 (3,216)23,265 (1,313)198,962 (4,529)
Municipal securities8 6,792 (30)— — 6,792 (30)
Pooled trust preferred securities issued by banks and insurers1 — — 1,042 (78)1,042 (78)
Small business administration pooled securities8 — — 37,832 (4,648)37,832 (4,648)
Total 196 $361,326 $(4,157)$983,248 $(51,720)$1,344,574 $(55,877)
Debt Securities, Held-to-maturity [Table Text Block]
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 recognized at the dates indicated:
June 30, 2026December 31, 2025
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. treasury securities$100,911 $— $(3,408)$— $97,503 $100,872 $— $(3,748)$— $97,124 
Agency mortgage-backed securities653,630 177 (38,749)— 615,058 694,903 339 (35,827)— 659,415 
Agency collateralized mortgage obligations348,671 — (45,598)— 303,073 370,698 — (44,900)— 325,798 
Small business administration pooled securities107,098 — (5,088)— 102,010 112,554 183 (4,341)— 108,396 
Total held to maturity securities$1,210,310 $177 $(92,843)$— $1,117,644 $1,279,027 $522 $(88,816)$— $1,190,733 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of securities available for sale and securities held to maturity at June 30, 2026 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$67,515 $67,059 $160,802 $151,729 $— $— $— $— $228,317 $218,788 
U.S. treasury securities199,932 197,482 190,768 181,693 — — — — 390,700 379,175 
Agency mortgage-backed securities23,567 23,396 208,375 200,532 21,425 20,460 742,895 717,421 996,262 961,809 
Agency collateralized mortgage obligations— — 4,477 4,429 1,690 1,576 255,171 245,524 261,338 251,529 
Municipal securities3,551 3,550 130,495 129,958 94,020 93,798 1,459 1,495 229,525 228,801 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,035 966 1,035 966 
Small business administration pooled securities— — — — 9,483 8,894 30,263 26,010 39,746 34,904 
Total available for sale securities$294,565 $291,487 $694,917 $668,341 $126,618 $124,728 $1,030,823 $991,416 $2,146,923 $2,075,972 
Held to maturity securities
U.S. treasury securities$49,964 $49,065 $49,953 $47,574 $994 $864 $— $— $100,911 $97,503 
Agency mortgage-backed securities80,520 79,977 375,469 352,741 87,173 79,429 110,468 102,911 653,630 615,058 
Agency collateralized mortgage obligations25,164 25,098 34,727 32,835 28,725 25,612 260,055 219,528 348,671 303,073 
Small business administration pooled securities— — — — 4,773 4,475 102,325 97,535 107,098 102,010 
Total held to maturity securities$155,648 $154,140 $460,149 $433,150 $121,665 $110,380 $472,848 $419,974 $1,210,310 $1,117,644 
Total$450,213 $445,627 $1,155,066 $1,101,491 $248,283 $235,108 $1,503,671 $1,411,390 $3,357,233 $3,193,616