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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
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
| 2021 |  | 2020 |  | 2019
| (Dollars in thousands)
Net gains recognized during the period on equity securities | $ | 554 |  |  | $ | 528 |  |  | $ | 1,566 |
Less: net gains recognized during the period on equity securities sold during the period | 192 |  |  | 14 |  |  | 18 |
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date | $ | 362 |  |  | $ | 514 |  |  | $ | 1,548 |
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, 2021 |  | December 31, 2020
| 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 | $ | 217,393 |  |  | $ | 990 |  |  | $ | (2,901) |  |  | $ | — |  |  | $ | 215,482 |  |  | $ | 22,476 |  |  | $ | 1,640 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,116 |
U.S. treasury securities | 873,467 |  |  | 172 |  |  | (12,191) |  |  | — |  |  | 861,448 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Agency mortgage-backed securities | 364,955 |  |  | 4,512 |  |  | (5,534) |  |  | — |  |  | 363,933 |  |  | 224,293 |  |  | 9,337 |  |  | (1) |  |  | — |  |  | 233,629 |
Agency collateralized mortgage obligations | 78,966 |  |  | 1,282 |  |  | (571) |  |  | — |  |  | 79,677 |  |  | 88,687 |  |  | 3,083 |  |  | (87) |  |  | — |  |  | 91,683 |
State, county, and municipal securities | 192 |  |  | 11 |  |  | — |  |  | — |  |  | 203 |  |  | 790 |  |  | 17 |  |  | — |  |  | — |  |  | 807 |
Single issuer trust preferred securities issued by banks | 489 |  |  | 2 |  |  | — |  |  | — |  |  | 491 |  |  | 489 |  |  | — |  |  | (1) |  |  | — |  |  | 488 |
Pooled trust preferred securities issued by banks and insurers | 1,199 |  |  | — |  |  | (199) |  |  | — |  |  | 1,000 |  |  | 1,429 |  |  | — |  |  | (373) |  |  | — |  |  | 1,056 |
Small business administration pooled securities | 47,075 |  |  | 1,839 |  |  | — |  |  | — |  |  | 48,914 |  |  | 57,289 |  |  | 3,792 |  |  | — |  |  | — |  |  | 61,081 |
Total available for sale securities | $ | 1,583,736 |  |  | $ | 8,808 |  |  | $ | (21,396) |  |  | $ | — |  |  | $ | 1,571,148 |  |  | $ | 395,453 |  |  | $ | 17,869 |  |  | $ | (462) |  |  | $ | — |  |  | $ | 412,860 |
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 which are 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, 2021
|  |  | 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 | 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 recognized in accumulated other comprehensive income (loss) at the dates indicated:
| December 31, 2021 |  | December 31, 2020
| 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 | $ | 32,987 |  | $ | — |  | $ | (441) |  | $ | — |  | $ | 32,546 |  |  | $ | — |  | $ | — |  | $ | — |  | — |  | $ | — |
U.S. treasury securities | 102,560 |  | 6 |  | (324) |  | — |  | 102,242 |  |  | 4,017 |  | 60 |  | — |  | — |  | 4,077 |
Agency mortgage-backed securities | 493,012 |  | 8,495 |  | (4,271) |  | — |  | 497,236 |  |  | 356,085 |  | 18,036 |  | — |  | — |  | 374,121 |
Agency collateralized mortgage obligations | 415,736 |  | 3,232 |  | (10,123) |  | — |  | 408,845 |  |  | 335,993 |  | 8,466 |  | (340) |  | — |  | 344,119 |
Single issuer trust preferred securities issued by banks | 1,500 |  | 8 |  | — |  | — |  | 1,508 |  |  | 1,500 |  | — |  | (2) |  | — |  | 1,498 |
Small business administration pooled securities | 21,023 |  | 733 |  | — |  | — |  | 21,756 |  |  | 26,917 |  | 1,445 |  | — |  | — |  | 28,362 |
Total held to maturity securities | $ | 1,066,818 |  | $ | 12,474 |  | $ | (15,159) |  | $ | — |  | $ | 1,064,133 |  |  | $ | 724,512 |  | $ | 28,007 |  | $ | (342) |  | $ | — |  | $ | 752,177 |
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, 2021 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 | $ | 10,000 |  |  | $ | 10,007 |  |  | $ | 43,831 |  |  | $ | 44,065 |  |  | $ | 163,562 |  |  | $ | 161,410 |  |  | $ | — |  |  | $ | — |  |  | $ | 217,393 |  |  | $ | 215,482 |
U.S. treasury securities | — |  |  | — |  |  | 643,068 |  |  | 633,504 |  |  | 230,399 |  |  | 227,944 |  |  | — |  |  | — |  |  | 873,467 |  |  | 861,448 |
Agency mortgage-backed securities | 14,411 |  |  | 14,563 |  |  | 95,373 |  |  | 96,519 |  |  | 142,730 |  |  | 139,331 |  |  | 112,441 |  |  | 113,520 |  |  | 364,955 |  |  | 363,933 |
Agency collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 78,966 |  |  | 79,677 |  |  | 78,966 |  |  | 79,677 |
State, county, and municipal securities | — |  |  | — |  |  | 192 |  |  | 203 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 192 |  |  | 203 |
Single issuer trust preferred securities issued by banks | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 489 |  |  | 491 |  |  | 489 |  |  | 491 |
Pooled trust preferred securities issued by banks and insurers | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,199 |  |  | 1,000 |  |  | 1,199 |  |  | 1,000 |
Small business administration pooled securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 47,075 |  |  | 48,914 |  |  | 47,075 |  |  | 48,914 |
Total available for sale securities | $ | 24,411 |  |  | $ | 24,570 |  |  | $ | 782,464 |  |  | $ | 774,291 |  |  | $ | 536,691 |  |  | $ | 528,685 |  |  | $ | 240,170 |  |  | $ | 243,602 |  |  | $ | 1,583,736 |  |  | $ | 1,571,148 |
Held to maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities | $ | — |  |  | $ | — |  |  | $ | 32,987 |  |  | $ | 32,546 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 32,987 |  |  | $ | 32,546 |
U.S. Treasury securities | 2,003 |  |  | 2,009 |  |  | — |  |  | — |  |  | 100,557 |  |  | 100,233 |  |  | — |  |  | — |  |  | 102,560 |  |  | 102,242 |
Agency mortgage-backed securities | — |  |  | — |  |  | 3,016 |  |  | 3,156 |  |  | 288,552 |  |  | 287,116 |  |  | 201,444 |  |  | 206,964 |  |  | 493,012 |  |  | 497,236 |
Agency collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 415,736 |  |  | 408,845 |  |  | 415,736 |  |  | 408,845 |
Single issuer trust preferred securities issued by banks | — |  |  | — |  |  | — |  |  | — |  |  | 1,500 |  |  | 1,508 |  |  | — |  |  | — |  |  | 1,500 |  |  | 1,508 |
Small business administration pooled securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21,023 |  |  | 21,756 |  |  | 21,023 |  |  | 21,756 |
Total held to maturity securities | 2,003 |  |  | 2,009 |  |  | 36,003 |  |  | 35,702 |  |  | 390,609 |  |  | 388,857 |  |  | 638,203 |  |  | 637,565 |  |  | 1,066,818 |  |  | 1,064,133 |
Total | $ | 26,414 |  |  | $ | 26,579 |  |  | $ | 818,467 |  |  | $ | 809,993 |  |  | $ | 927,300 |  |  | $ | 917,542 |  |  | $ | 878,373 |  |  | $ | 881,167 |  |  | $ | 2,650,554 |  |  | $ | 2,635,281 |

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