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Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash paid during the year for: |  |  |
Interest | $ 33,964,000 | $ 56,005,000 | $ 40,071,000
Income taxes | 25,914,000 | 21,787,000 | 23,826,000
Non-cash investing and financing activities: |  |  |
Real Estate Owned, Transfer to Real Estate Owned | 3,865,000 | 4,723,000 | 4,334,000
Fair value of loans transferred from held to maturity to available for sale | 37,305,000 | 30,359,000 | 37,367,000
Transfer of Loans Held-for-sale to Portfolio Loans | 4,335,000 | 482,000 | 0
Gross (decrease) increase in market value adjustment to securities available for sale | 19,911,000 | 20,604,000 | (5,319,000)
Gross (decrease) increase in market value adjustment to derivatives | (4,467,000) | 935,000 | 336,000
Investments Committed to Purchase, Not Yet Paid | (34,185,000) | 25,484,000 | 0
Increase in Commitment to Limited Partnership | 0 | 1,469,000 | 0
Noncash or Part Noncash Acquisition, Value of Assets Acquired | 0 | (361,595,000) | (21,834,000)
Other Significant Noncash Transaction, Consideration Received | (384,000) | 484,000 | 0
Treasury stock reissued | $ 1,594,000 | $ 2,531,000 | $ 2,257,000

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