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Parent Company Only Financial Information - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,040 | $ 6,416 | $ 4,065 | $ 5,019 | $ 5,508 | $ 5,522 | $ 5,602 | $ 5,565 | $ 20,540 | $ 22,197 | $ 23,074
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Net unrealized (gains) losses on trading securities |  |  |  |  |  |  |  |  | (503) | 213 | (121)
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | (3,906) | 93 | 6,266
Increase in other liabilities |  |  |  |  |  |  |  |  | 2,095 | 5,435 | (6,605)
Net Cash Provided By Operating Activities |  |  |  |  |  |  |  |  | 26,764 | 33,636 | 28,920
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (150,883) | (100,714) | (55,526)
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  | (9,546) | (9,515) | (9,521)
Proceeds from issuance of long term debt |  |  |  |  |  |  |  |  | 80,000 | 50,000 | 950
Purchase of treasury stock |  |  |  |  |  |  |  |  | (44) | (868) | (1,675)
Net Cash Provided By Financing Activities |  |  |  |  |  |  |  |  | 126,041 | 66,411 | 24,901
Net increase (decrease) in cash |  |  |  |  |  |  |  |  | 1,922 | (667) | (1,705)
Cash and Cash Equivalents, Beginning |  |  |  | 27,261 |  |  |  | 27,928 | 27,261 | 27,928 | 29,633
Cash and Cash Equivalents, Ending | 29,183 |  |  |  | 27,261 |  |  |  | 29,183 | 27,261 | 27,928
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 20,540 | 22,197 | 23,074
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net income of bank subsidiary |  |  |  |  |  |  |  |  | (13,184) | (11,889) | (12,327)
Equity in undistributed net income (distributions in excess of net income) of non-bank subsidiaries |  |  |  |  |  |  |  |  | 976 | (585) | (949)
Net unrealized (gains) losses on trading securities |  |  |  |  |  |  |  |  | (58) | (11) | 1
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | (1,277) | 9 | (13)
Increase in other liabilities |  |  |  |  |  |  |  |  | 1,645 | 663 | 601
Net Cash Provided By Operating Activities |  |  |  |  |  |  |  |  | 8,642 | 10,384 | 10,387
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Investment in bank subsidiaries |  |  |  |  |  |  |  |  | (49,223) | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | (49,223) | 0 | 0
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  | (9,546) | (9,515) | (9,521)
Proceeds from issuance of long term debt |  |  |  |  |  |  |  |  | 50,000 | 0 | 0
Purchase of treasury stock |  |  |  |  |  |  |  |  | (44) | (868) | (1,675)
Net proceeds from sale of treasury stock and option exercises |  |  |  |  |  |  |  |  | 0 | 0 | 587
Net advance from subsidiary |  |  |  |  |  |  |  |  | 50 | 0 | 0
Net Cash Provided By Financing Activities |  |  |  |  |  |  |  |  | 40,460 | (10,383) | (10,609)
Net increase (decrease) in cash |  |  |  |  |  |  |  |  | (121) | 1 | (222)
Cash and Cash Equivalents, Beginning |  |  |  | $ 1,557 |  |  |  | $ 1,556 | 1,557 | 1,556 | 1,778
Cash and Cash Equivalents, Ending | $ 1,436 |  |  |  | $ 1,557 |  |  |  | $ 1,436 | $ 1,557 | $ 1,556

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