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Condensed Financial Information - Parent Company Only Cash Flows (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows From Operating Activities: |  |  |
Net Income | $ 208,393,000 | $ 171,753,000 | $ 161,625,000
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities [Abstract] |  |  |
Amortization of financing costs | 813,000 | 845,000 | 617,000
Stock-based compensation | 7,965,000 | 5,209,000 | 6,556,000
Excess tax benefits from stock-based compensation | 0 | 0 | (964,000)
Decrease (increase) in other assets | (26,090,000) | (7,958,000) | (53,922,000)
Increase (decrease) in other liabilities and payable to non-bank subsidiaries | (306,000) | (2,480,000) | 45,090,000
Total adjustments | 88,427,000 | 116,005,000 | 64,448,000
Net cash provided by operating activities | 296,820,000 | 287,758,000 | 226,073,000
Cash Flows From Investing Activities |  |  |
Net cash used in investing activities | (740,717,000) | (1,135,331,000) | (1,037,616,000)
Cash Flows From Financing Activities: |  |  |
Repayments of long-term debt | (100,165,000) | (115,153,000) | (236,640,000)
Additions to long-term debt | 50,000,000 | 223,251,000 | 215,884,000
Net proceeds from issuance of common stock | 6,735,000 | 8,538,000 | 16,167,000
Excess tax benefits from stock-based compensation | 0 | 0 | 964,000
Dividends paid | (89,654,000) | (80,368,000) | (69,382,000)
Acquisition of treasury stock | (95,308,000) | 0 | (18,545,000)
Net cash provided by financing activities | 487,488,000 | 897,143,000 | 832,649,000
Parent |  |  |
Cash Flows From Operating Activities: |  |  |
Net Income | 208,393,000 | 171,753,000 | 161,625,000
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities [Abstract] |  |  |
Amortization of financing costs | 813,000 | 845,000 | 0
Stock-based compensation | 7,967,000 | 4,740,000 | 6,556,000
Excess tax benefits from stock-based compensation | 0 | 0 | (964,000)
Decrease (increase) in other assets | 6,327,000 | (17,882,000) | (16,585,000)
Equity in undistributed net income of subsidiaries | (73,460,000) | (128,298,000) | (65,340,000)
Increase (decrease) in other liabilities and payable to non-bank subsidiaries | 36,273,000 | 31,241,000 | (5,928,000)
Total adjustments | (22,080,000) | (109,354,000) | (82,261,000)
Net cash provided by operating activities | 186,313,000 | 62,399,000 | 79,364,000
Cash Flows From Investing Activities |  |  |
Net cash used in investing activities | 0 | 0 | 0
Cash Flows From Financing Activities: |  |  |
Repayments of long-term debt | 0 | (100,000,000) | 0
Additions to long-term debt | 0 | 123,251,000 | 0
Net proceeds from issuance of common stock | 6,733,000 | 9,007,000 | 16,167,000
Excess tax benefits from stock-based compensation | 0 | 0 | 964,000
Dividends paid | (89,654,000) | (80,368,000) | (69,382,000)
Acquisition of treasury stock | (95,308,000) | 0 | (18,545,000)
Net cash provided by financing activities | (178,229,000) | (48,110,000) | (70,796,000)
Net Increase in Cash and Cash Equivalents | 8,084,000 | 14,289,000 | 8,568,000
Cash and Due From Banks at Beginning of Year | 22,857,000 | 8,568,000 | 0
Cash and Due From Banks at End of Year | $ 30,941,000 | $ 22,857,000 | $ 8,568,000

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