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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Jun. 03, 2024 | Mar. 29, 2024 | Mar. 23, 2023 | Jun. 30, 2019 | Dec. 31, 2009
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | $ 2,394,885,000 | $ 1,429,948,000 |  |  |  |  |  |
Estimated Fair Value Gain | 61,153,000 | 8,727,000 |  |  |  |  |  |
Estimated Fair Value Loss | $ 97,861,000 | 10,330,000 |  |  |  |  |  |
Variable rate basis, variable rate receivable on notional amount | three-month LIBOR |  |  |  |  |  |  |
After-tax unrealized gain on cash flow hedge in other comprehensive income | $ 22,800,000 | 2,100,000 |  |  |  |  |  |
Ineffectiveness in the cash flow hedge | 0 |  | $ 0 |  |  |  |  |
Gain or loss recorded | 0 | 0 | 0 |  |  |  |  |
Interest Rate Derivative Assets, at Fair Value | 51,200,000 | 6,700,000 |  |  |  |  |  |
Interest Rate Derivative Liabilities, at Fair Value | 54,400,000 | 7,300,000 |  |  |  |  |  |
Interest Rate Derivatives, at Fair Value, Net | 3,200,000 | 622,000 |  |  |  |  |  |
Estimated gain (loss) on fair value of open contracts related to mortgage servicing rights | 5,900,000 | 1,100,000 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value |  | 217,000 |  |  |  |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |  |  |  |  |  |
Cash flow hedge assets |  | 217,000 |  |  |  |  |  |
Other Liabilities |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Cash flow hedge liability | 43,000,000.0 | 2,900,000 |  |  |  |  |  |
FHLB Advances |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Collateral provided | 52,400,000 |  |  |  |  |  |  |
Mortgage loan pipeline |  |  |  |  |  |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |  |  |  |  |  |
Obligation | 229,082,000 | 95,731,000 | 80,785,000 |  |  |  |  |
Expected closures |  |  |  |  |  |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |  |  |  |  |  |
Obligation | 171,811,000 | 71,798,000 | 60,588,000 |  |  |  |  |
Cash flow hedge | Borrower |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Collateral provided | 72,300,000 |  |  |  |  |  |  |
Cash flow hedge | FHLB Advances - One |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 350,000,000 |  |  |  |  | $ 350,000,000 |  |
Outstanding advances |  | 350,000,000 |  |  |  |  |  |
Cash flow hedge | FHLB Advances - Two |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 150,000,000 |  |  |  | $ 150,000,000 |  |  |
Outstanding advances |  | 150,000,000 |  |  |  |  |  |
Cash flow hedge | FHLB Advances - Three |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 200,000,000 |  |  | $ 200,000,000 |  |  | $ 200,000,000 |
Interest rate contracts |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 1,400,000 | 710,100,000 |  |  |  |  |  |
Mortgage servicing rights hedging | Non-designated hedges |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 146,500,000 | 129,000,000.0 |  |  |  |  |  |
Mortgage servicing rights hedging | Non-designated hedges | Other Liabilities |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 146,500,000 | 129,000,000 |  |  |  |  |  |
Estimated Fair Value Gain | 5,901,000 | 1,100,000 |  |  |  |  |  |
Mortgage loan pipeline commitments |  |  |  |  |  |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |  |  |  |  |  |
Obligation | 6,490,000 | 1,364,000 | 1,160,000 |  |  |  |  |
Forward commitments |  |  |  |  |  |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |  |  |  |  |  |
Obligation | 174,011,000 | 80,059,000 | 87,773,000 |  |  |  |  |
Fair value of forward commitments | 2,482,000 | 626,000 | $ 258,000 |  |  |  |  |
Forward commitments | Non-designated hedges | Other Assets |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 174,011,000 | 80,059,000 |  |  |  |  |  |
Estimated Fair Value Gain | 4,008,000 | 738,000 |  |  |  |  |  |
Interest rate swap | LIBOR |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 8,000,000.0 |  |  |  |  |  |  |
Interest rate swap | Cash flow hedge |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  |  | $ 8,000,000.0
Interest rate swap | Cash flow hedge | Other Liabilities | Counterparty |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 8,000,000.0 | 8,000,000 |  |  |  |  |  |
Estimated Fair Value Loss |  | 25,000 |  |  |  |  |  |
Interest rate swap | Cash flow hedge | FHLB Advances | Other Liabilities | Counterparty |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 700,000,000 | 500,000,000 |  |  |  |  |  |
Estimated Fair Value Gain |  | 217,000 |  |  |  |  |  |
Estimated Fair Value Loss | $ 43,025,000 | 2,902,000 |  |  |  |  |  |
Interest rate swap | Cash flow hedge | FHLB Advances - One |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount |  | 350,000,000 |  |  |  |  |  |
Fixed rate payable on notional amount (as a percent) | 2.44% |  |  |  |  |  |  |
Interest rate swap | Cash flow hedge | FHLB Advances - Two |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount |  | 150,000,000 |  |  |  |  |  |
Fixed rate payable on notional amount (as a percent) | 2.21% |  |  |  |  |  |  |
Interest rate swap | Cash flow hedge | FHLB Advances - Three |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | $ 200,000,000 |
Fixed rate payable on notional amount (as a percent) | 1.89% |  |  |  |  |  |  |
Interest rate swap | Cash flow hedge | LIBOR |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Fixed rate payable on notional amount (as a percent) | 4.06% |  |  |  |  |  |  |
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - One |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Variable rate (as a percent) | 1.12% |  |  |  |  |  |  |
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Two |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Variable rate (as a percent) | 1.37% |  |  |  |  |  |  |
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Three |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Variable rate (as a percent) | 1.46% |  |  |  |  |  |  |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | $ 2,700,000 |  |  |  |  |  |  |
Interest rate swap | Fair Value Hedging | Other Assets and Other Liabilities | Counterparty |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 2,738,000 | 2,799,000 |  |  |  |  |  |
Estimated Fair Value Loss | 472,000 | 108,000 |  |  |  |  |  |
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 685,818,000 | 355,045,000 |  |  |  |  |  |
Estimated Fair Value Gain | 51,188,000 | 6,112,000 |  |  |  |  |  |
Estimated Fair Value Loss | 63,000 | 2,137,000 |  |  |  |  |  |
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty |  |  |  |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |  |  |  |
Notional Amount | 685,818,000 | 355,045,000 |  |  |  |  |  |
Estimated Fair Value Gain | 56,000 | 560,000 |  |  |  |  |  |
Estimated Fair Value Loss | $ 54,301,000 | $ 5,158,000 |  |  |  |  |  |

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