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Parent Company Only Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities |  |  |
Net income | $ 100,344 | $ 102,953 | $ 98,928
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 12,273 | 11,879 | 9,556
Net security losses (gains) | (1,724) | (733) | 1,780
Stock-based compensation | 7,135 | 3,997 | 3,721
Changes in assets and liabilities: |  |  |
(Increase) decrease in other assets | (5,899) | 5,397 | 9,580
Increase (decrease) in other liabilities | (6,551) | (7,380) | 2,195
Net cash provided by (used in) operating Activities | 169,299 | 80,800 | 202,547
Cash Flows from Investing Activities |  |  |
Purchases of equity securities | (13,123) | (550) |
Purchases of premises and equipment | (4,198) | (13,238) | (11,618)
Net cash (used in) provided by investing activities | (735,664) | 64,958 | (55,350)
Cash Flows from Financing Activities |  |  |
Cash paid for withholding taxes on stock-based payments | (635) | (863) | (1,208)
Cash dividends paid | (48,012) | (45,171) | (39,010)
Proceeds from stock options exercised | 101 | 169 | 392
Purchase of treasury stock | (12,272) | (24,292) |
Common stock issuance costs |  | (234) |
Net cash provided by (used in) financing activities | 725,614 | 143,557 | (260,496)
Net increase (decrease) in cash and cash equivalents | 159,249 | 289,315 | (113,299)
Cash and cash equivalents, beginning of period | 529,288 | 239,973 | 353,272
Cash and cash equivalents, ending of period | 688,537 | 529,288 | 239,973
Parent |  |  |
Cash Flows from Operating Activities |  |  |
Net income | 100,344 | 102,953 | 98,928
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 648 | 420 | 232
Distributions less than net income of subsidiaries | 3,281 | (51,961) | (93,451)
Net security losses (gains) | 393 | 759 | (2,322)
Stock-based compensation | 7,135 | 3,997 | 3,721
Changes in assets and liabilities: |  |  |
(Increase) decrease in other assets | 405 | (4,279) | 13,985
Increase (decrease) in other liabilities | (5,772) | (1,280) | 1,341
Net cash provided by (used in) operating Activities | 106,434 | 50,609 | 22,434
Cash Flows from Investing Activities |  |  |
Purchases of equity securities |  | (520) |
Net cash paid for business acquisition |  | (90,722) |
Purchases of premises and equipment | (19) | (31) | (46)
Net cash (used in) provided by investing activities | (19) | (91,273) | (46)
Cash Flows from Financing Activities |  |  |
Proceeds from charter amendment with subsidiary bank |  |  | 40,000
Cash paid for withholding taxes on stock-based payments | (635) | (863) | (817)
Cash dividends paid | (48,012) | (45,171) | (39,010)
Repayments of debt | (74,000) | (6,000) | (5,500)
Proceeds from issuance of debt | 142,634 | 60,000 |
Proceeds from stock options exercised | 101 | 169 |
Purchase of treasury stock | (12,272) | (24,292) |
Common stock issuance costs |  | (234) |
Net cash provided by (used in) financing activities | 7,816 | (16,391) | (5,327)
Net increase (decrease) in cash and cash equivalents | 114,231 | (57,055) | 17,061
Cash and cash equivalents, beginning of period | 14,952 | 72,007 | 54,946
Cash and cash equivalents, ending of period | $ 129,183 | $ 14,952 | $ 72,007

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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