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Parent Company Cash Flow Statement (Details) - 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 29,934 | $ 33,015 | $ 31,118 | $ 27,555 | $ 22,064 | $ 23,852 | $ 20,563 | $ 20,725 | $ 121,622 | $ 87,204 | $ 76,648
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax expense |  |  |  |  |  |  |  |  |  | (4,497) | 9,211 | (5)
Change in other liabilities |  |  |  |  |  |  |  |  |  | 7,100 | (3,825) | (8,738)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 141,837 | 130,909 | 92,899
Cash flows used in investing activities |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (387,511) | (316,769) | (238,886)
Cash flows provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  |  |  |  |  |  |  | (1,371) | (1,422) | (696)
Cash received from stock option exercises |  |  |  |  |  |  |  |  |  | 184 | 214 | 201
Proceeds from shares issued under the direct stock purchase plan |  |  |  |  |  |  |  |  |  | 2,712 | 1,636 | 2,323
Common dividends paid |  |  |  |  |  |  |  |  |  | (40,167) | (34,045) | (29,711)
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | 283,013 | 109,881 | 159,317
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 37,339 | (75,979) | 13,330
Cash and cash equivalents at beginning of year |  |  |  |  | 213,116 |  |  |  | 289,095 | 213,116 | 289,095 | 275,765
Cash and cash equivalents at end of period |  | 250,455 |  |  |  | 213,116 |  |  |  | 250,455 | 213,116 | 289,095
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries | [1] | 1,128,407 |  |  |  | 1,010,125 |  |  |  | 1,128,407 | 1,010,125 |
Net income |  |  |  |  |  |  |  |  |  | 121,622 | 87,204 | 76,648
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |
Amortization (accretion) |  |  |  |  |  |  |  |  |  | 54 | 12 | (154)
Deferred income tax expense |  |  |  |  |  |  |  |  |  | 49 | 51 | 678
Change in prepaid income taxes and other assets |  |  |  |  |  |  |  |  |  | 135 | (99) | 423
Change in other liabilities |  |  |  |  |  |  |  |  |  | 6 | (562) | (5,532)
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | (53,450) | (42,620) | (36,062)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 68,416 | 43,986 | 36,001
Cash flows used in investing activities |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions, net of cash acquired (1) | [2] |  |  |  |  |  |  |  |  | (13,649) | (4,834) | (950)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (13,649) | (4,834) | (950)
Cash flows provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  |  |  |  |  |  |  | (1,371) | (1,422) | (696)
Cash received from stock option exercises |  |  |  |  |  |  |  |  |  | 184 | 214 | 201
Proceeds from shares issued under the direct stock purchase plan |  |  |  |  |  |  |  |  |  | 2,712 | 1,636 | 2,323
Common dividends paid |  |  |  |  |  |  |  |  |  | (40,167) | (34,045) | (29,711)
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | (38,642) | (33,617) | (27,883)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 16,125 | 5,535 | 7,168
Cash and cash equivalents at beginning of year |  |  |  |  | $ 48,131 |  |  |  | $ 42,596 | 48,131 | 42,596 | 35,428
Cash and cash equivalents at end of period |  | 64,256 |  |  |  | 48,131 |  |  |  | 64,256 | 48,131 | $ 42,596
Cash | [3] | $ 64,256 |  |  |  | $ 48,131 |  |  |  | $ 64,256 | $ 48,131 |
[1] | eliminates in consolidation
[2] | The majority of the net assets acquired at the parent company represented each of the acquired companies' investments in their wholly owned subsidiaries, which were eliminated in consolidation at December 31, 2018, 2017, and 2016, respectively.
[3] | Entire balance eliminates in consolidation.

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