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Parent Company Financial Information (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows From Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 40,317 | $ 38,948 | $ 37,296 | $ 35,715 | $ 15,569 | $ 29,874 | $ 27,772 | $ 27,017 | $ 25,717 | $ 24,523 | $ 24,145 | $ 23,322 | $ 152,276 | $ 100,232 | $ 97,707
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net tax benefits from stock compensation |  |  |  |  |  |  |  |  |  |  |  |  | 110 | 460 |
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (400)
Increase in other assets |  |  |  |  |  |  |  |  |  |  |  |  | (17,301) | (19,324) | (5,025)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 2,061 | 10,348 | 8,545
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | 164,455 | 160,924 | 116,820
Cash Flows From Investing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  | 36,300 | 73,100 | 94,300
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |  |  | (783,801) | (810,377) | (750,952)
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of equity compensation plans |  |  |  |  |  |  |  |  |  |  |  |  | 776 | 372 | 955
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400
Proceeds from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | 808 | 836 | 801
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  | 750,737 | 471,763 | 703,932
Net (Decrease) Increase in Cash |  |  |  |  |  |  |  |  |  |  |  |  | 131,391 | (177,690) | 69,800
Cash and Cash Equivalents at Beginning of Period |  |  |  | 190,473 |  |  |  | 368,163 |  |  |  | 298,363 | 190,473 | 368,163 | 298,363
Cash and Cash Equivalents at End of Period | 321,864 |  |  |  | 190,473 |  |  |  | 368,163 |  |  |  | 321,864 | 190,473 | 368,163
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 152,276 | 100,232 | 97,707
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | (163,393) | (108,941) | (103,374)
Net tax benefits from stock compensation |  |  |  |  |  |  |  |  |  |  |  |  | 110 | 460 |
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (400)
Increase in other assets |  |  |  |  |  |  |  |  |  |  |  |  | (2,508) | (988) | (1,491)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (61) | (189) | 3,186
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | (13,576) | (9,426) | (4,372)
Cash Flows From Investing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135
Investment in subsidiary (net) |  |  |  |  |  |  |  |  |  |  |  |  | 6,892 | (460) | (124,636)
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |  |  | 6,892 | (460) | (124,501)
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance in long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 147,586
Proceeds from exercise of equity compensation plans |  |  |  |  |  |  |  |  |  |  |  |  | 776 | 372 | 955
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400
Proceeds from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | 808 | 836 | 801
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  | 1,584 | 1,208 | 149,742
Net (Decrease) Increase in Cash |  |  |  |  |  |  |  |  |  |  |  |  | (5,100) | (8,678) | 20,869
Cash and Cash Equivalents at Beginning of Period |  |  |  | $ 77,883 |  |  |  | $ 86,561 |  |  |  | $ 65,692 | 77,883 | 86,561 | 65,692
Cash and Cash Equivalents at End of Period | $ 72,783 |  |  |  | $ 77,883 |  |  |  | $ 86,561 |  |  |  | $ 72,783 | $ 77,883 | $ 86,561

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