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Investment Securities Available-for-Sale - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Federal Reserve and Federal Home Loan Bank stock | $ 40,018 |  | $ 40,018 |  | $ 35,194
Allowance for Credit Losses | $ 138 |  | $ 138 |  | 0
Debt securities as percentage of total investment securities | 99.90% |  | 99.90% |  |
Debt securities weighted average duration |  |  | 3 years 1 month 6 days |  |
Proceeds from sale/call of available-for-sale securities |  |  | $ 119,988 | $ 42,143 |
Holdings of securities of any one issuer | 10.00% |  | 10.00% |  |
Gross realized gains on sales of investment securities |  |  | $ 1,500 | 1,500 |
Noninterest income | $ 12,495 | $ 6,360 | 17,965 | 12,651 |
Gross realized losses on sales of investment |  |  | 0 | $ 0 |
Other Assets |  |  |  |  |
Accrued interest on available for sale securities | 2,700 |  | 2,700 |  | 3,200
Interest Rate Swap |  |  |  |  |
Noninterest income |  |  | 829 |  |
Collateral Pledged |  |  |  |  |
Available-for-sale securities pledged as collateral | $ 346,000 |  | $ 346,000 |  | $ 378,000

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