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Parent Company Financial Information- Cash flow (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net Income | $ 176,691 | $ 132,217 | $ 142,943
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Net tax benefits from stock compensation | 1,097 | 118 | (48)
Securities premium amortization (discount accretion), net | 4,031 | 8,196 | 5,186
Depreciation and amortization | 5,874 | 4,696 | 6,174
Increase (decrease) in other assets | 1,358 | (28,626) | (21,421)
Increase (decrease) in other liabilities | 24,823 | 9,826 | 19,809
Net cash provided by (used in) operating activities | 239,534 | 133,139 | 132,684
Cash Flows From Investing Activities: |  |  |
Purchases of available-for-sale investment securities | (2,029,434) | (739,955) | (374,648)
Proceeds from maturities of available-for-sale securities | 313,921 | 302,471 | 214,204
Net cash (used in) provided by investing activities | (857,922) | (557,676) | (637,127)
Cash Flows From Financing Activities: |  |  |
Repayment of long-term borrowings | (200,000) | 0 | 0
Proceeds from exercise of stock options | 0 | 63 | 332
Proceeds from employee stock purchase plan | 496 | 760 | 782
Common stock repurchased | 682 | 61,432 | 54,903
Cash dividends paid | 44,691 | 28,330 | 22,332
Net cash (used in) provided by financing activities | 543,555 | 1,971,619 | 424,552
Net (Decrease) Increase In Cash and Cash Equivalents | (74,833) | 1,547,082 | (79,891)
Cash and Cash Equivalents at Beginning of Period | 1,789,055 | 241,973 | 321,864
Cash and Cash Equivalents at End of Period | 1,714,222 | 1,789,055 | 241,973
Parent Company |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net Income | 176,691 | 132,217 | 142,943
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed income of subsidiary | (17,449) | (6,191) | (70,396)
Net tax benefits from stock compensation | 7,811 | 118 | 10
Securities premium amortization (discount accretion), net | 5 | 6 | 2
Depreciation and amortization | 0 | 390 | 0
Increase (decrease) in other assets | 66,598 | (48,966) | (21,447)
Increase (decrease) in other liabilities | (681) | 6,823 | 2,460
Net cash provided by (used in) operating activities | 232,975 | 84,397 | 53,572
Cash Flows From Investing Activities: |  |  |
Purchases of available-for-sale investment securities | (40,000) | (10,000) | (7,030)
Proceeds from maturities of available-for-sale securities | 13,031 | 613 | 0
Investment in subsidiary (net) | 0 | 0 | 0
Net cash (used in) provided by investing activities | (26,969) | (9,387) | (7,030)
Cash Flows From Financing Activities: |  |  |
Repayment of long-term borrowings | (148,407) | 0 | 0
Proceeds from exercise of stock options | 0 | 63 | 332
Proceeds from employee stock purchase plan | 496 | 760 | 782
Common stock repurchased | (682) | (61,432) | (54,903)
Cash dividends paid | (44,691) | (28,330) | (22,332)
Net cash (used in) provided by financing activities | (193,284) | (88,939) | (76,121)
Net (Decrease) Increase In Cash and Cash Equivalents | 12,722 | (13,929) | (29,579)
Cash and Cash Equivalents at Beginning of Period | 29,275 | 43,204 | 72,783
Cash and Cash Equivalents at End of Period | $ 41,997 | $ 29,275 | $ 43,204

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