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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Supplemental Cash Flow Information [Abstract] |  |  |
Real Estate Owned, Transfer to Real Estate Owned | $ 4,723,000 | $ 4,334,000 | $ 3,067,000
Cash paid during the year for: |  |  |
Interest | 56,005,000 | 40,071,000 | 21,552,000
Income taxes | 21,787,000 | 23,826,000 | 27,902,000
Non-cash investing and financing activities: |  |  |
Loans transferred to other real estate owned and repossessed assets | 0 | 0 | 1,891,000
Fair value of loans transferred from held to maturity to available for sale | 30,359,000 | 37,367,000 | 15,102,000
Transfer of Loans Held-for-sale to Portfolio Loans | 482,000 | 0 | 0
Gross (decrease) increase in market value adjustment to securities available for sale | 20,604,000 | (5,319,000) | 1,983,000
Gross increase (decrease) in market value adjustment to derivatives | 935,000 | 336,000 | (783,000)
Noncash or Part Noncash Acquisition, Value of Assets Acquired | (361,595,000) | (21,834,000) | (37,070,000)
Other Significant Noncash Transaction, Consideration Received | 484,000 | 0 | 245,000
Treasury stock reissued | 2,531,000 | 2,257,000 | 2,258,000
Investments Committed to Purchase, Not Yet Paid | 25,484,000 | 0 | 0
Increase in Commitment to Limited Partnership | $ 1,469,000 | $ 0 | $ 0

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