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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss). |
Accumulated Other Comprehensive Income (Loss) | The following table represents changes in AOCI by component, net of tax, for the period below (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2022 | ​ | 2021
​ | ​ | ​ | Before Tax | ​ | ​ | Tax Effect | ​ | ​ | Net of Tax | ​ | ​ | Before Tax | ​ | ​ | Tax Effect | ​ | ​ | Net of Tax
Unrealized gains (losses) on debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (32,272) | ​ | $ | 9,199 | ​ | $ | (23,073) | ​ | $ | 49,644 | ​ | $ | (14,151) | ​ | $ | 35,493
Unrealized holding gains (losses) on debt securities available for sale, net | ​ | ​ | (104,282) | ​ | ​ | 29,726 | ​ | ​ | (74,556) | ​ | ​ | (42,072) | ​ | ​ | 11,993 | ​ | ​ | (30,079)
Unrealized losses on debt securities transferred from held to maturity to available for sale | ​ | ​ | (48,456) | ​ | ​ | 13,812 | ​ | ​ | (34,644) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Amounts reclassified from AOCI, net | ​ | ​ | (106) | ​ | ​ | 30 | ​ | ​ | (76) | ​ | ​ | (25) | ​ | ​ | 7 | ​ | ​ | (18)
Amortization of unrealized losses on securities transferred to held to maturity | ​ | ​ | 883 | ​ | ​ | (252) | ​ | ​ | 631 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at end of period | ​ | $ | (184,233) | ​ | $ | 52,515 | ​ | $ | (131,718) | ​ | $ | 7,547 | ​ | $ | (2,151) | ​ | $ | 5,396
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized gains (losses) on cash flow hedges | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (958) | ​ | $ | 273 | ​ | $ | (685) | ​ | $ | (3,055) | ​ | $ | 871 | ​ | $ | (2,184)
Unrealized holding gains (losses) on cash flow hedges, net | ​ | ​ | (6,776) | ​ | ​ | 1,931 | ​ | ​ | (4,845) | ​ | ​ | 574 | ​ | ​ | (164) | ​ | ​ | 410
Amounts reclassified from AOCI, net | ​ | ​ | (500) | ​ | ​ | 143 | ​ | ​ | (357) | ​ | ​ | 278 | ​ | ​ | (79) | ​ | ​ | 199
Balance at end of period | ​ | $ | (8,234) | ​ | $ | 2,347 | ​ | $ | (5,887) | ​ | $ | (2,203) | ​ | $ | 628 | ​ | $ | (1,575)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total AOCI | ​ | $ | (192,467) | ​ | $ | 54,862 | ​ | $ | (137,605) | ​ | $ | 5,344 | ​ | $ | (1,523) | ​ | $ | 3,821

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