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Parent Company Only Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 12, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows from Operating Activities |  |  |  |
Net income |  | $ 102,953 | $ 98,928 | $ 62,726
Adjustments to reconcile net income to net cash provided by (used in) |  |  |  |
Depreciation and amortization |  | 11,879 | 9,556 | 8,615
Net security losses (gains) |  | (733) | 1,780 | (362)
Stock-based compensation |  | 3,997 | 3,721 | 2,752
Changes in assets and liabilities: |  |  |  |
Decrease (increase) in other assets |  | 5,397 | 9,580 | 8,925
(Decrease) increase in other liabilities |  | (7,380) | 2,195 | (4,193)
Net cash provided by operating activities |  | 80,800 | 202,547 | 253,358
Cash Flows from Investing Activities |  |  |  |
Purchase of equity securities |  | (550) |  |
Purchases of premises and equipment |  | (13,238) | (11,618) | (14,980)
Net cash provided by (used in) investing activities |  | 64,958 | (55,350) | (293,850)
Cash Flows from Financing Activities |  |  |  |
Proceeds from charter amendment with subsidiary bank | $ 40,000 |  |  |
Cash paid for withholding taxes on share-based payments |  | (863) | (1,208) | (2,274)
Cash dividends paid |  | (45,171) | (39,010) | (30,707)
Proceeds from stock options exercised |  | 169 | 392 | 906
Purchase of treasury stock |  | (24,292) |  |
Common stock issuance costs |  | (234) |  | (365)
Net cash provided by (used in) financing activities |  | 143,557 | (260,496) | 227,058
Net (decrease) increase in cash and due from subsidiary bank |  | 289,315 | (113,299) | 186,566
Cash and cash equivalents, beginning of period |  | 239,973 | 353,272 | 166,706
Cash and cash equivalents, ending of period |  | 529,288 | 239,973 | 353,272
Parent |  |  |  |
Cash Flows from Operating Activities |  |  |  |
Net income |  | 102,953 | 98,928 | 62,726
Adjustments to reconcile net income to net cash provided by (used in) |  |  |  |
Depreciation and amortization |  | 420 | 232 | 487
Distributions less than net income of subsidiaries |  | (51,961) | (93,451) | (69,940)
Net security losses (gains) |  | 759 | (2,322) |
Stock-based compensation |  | 3,997 | 3,721 | 2,752
Changes in assets and liabilities: |  |  |  |
Decrease (increase) in other assets |  | (4,279) | 13,985 | (1,105)
(Decrease) increase in other liabilities |  | (1,280) | 1,341 | (2,762)
Net cash provided by operating activities |  | 50,609 | 22,434 | (7,842)
Cash Flows from Investing Activities |  |  |  |
Purchase of equity securities |  | (520) |  |
Net cash (outlay) received for business acquisition |  | (90,722) |  | (61,371)
Purchases of premises and equipment |  | (31) | (46) |
Net cash provided by (used in) investing activities |  | (91,273) | (46) | (61,371)
Cash Flows from Financing Activities |  |  |  |
Proceeds from charter amendment with subsidiary bank |  |  | 40,000 | 40,000
Cash paid for withholding taxes on share-based payments |  | (863) | (817) | (1,414)
Cash dividends paid |  | (45,171) | (39,010) | (30,707)
Repayments of debt |  | (6,000) | (5,500) | (9,800)
Proceeds from issuance of debt |  | 60,000 |  | 98,312
Proceeds from stock options exercised |  | 169 |  | 626
Purchase of treasury stock |  | (24,292) |  |
Common stock issuance costs |  | (234) |  | (365)
Net cash provided by (used in) financing activities |  | (16,391) | (5,327) | 96,652
Net (decrease) increase in cash and due from subsidiary bank |  | (57,055) | 17,061 | 27,439
Cash and cash equivalents, beginning of period |  | 72,007 | 54,946 | 27,507
Cash and cash equivalents, ending of period |  | $ 14,952 | $ 72,007 | $ 54,946

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