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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]                      
Net income $ 5,508 $ 5,522 $ 5,602 $ 5,565 $ 6,743 $ 5,548 $ 5,617 $ 5,166 $ 22,197 $ 23,074 $ 16,679
Adjustments to reconcile net income to net cash provided by operating activities:                      
Net unrealized (gains) losses on trading securities                 213 (121) (728)
Decrease (increase) in other assets                 83 6,266 (3,124)
Increase in other liabilities                 5,435 (6,605) 8,387
Net cash provided by operating activities                 33,626 28,920 33,609
Cash flows from investing activities                 (100,714) (55,526) (36,452)
Cash Flows From Financing Activities:                      
Dividends paid                 (9,515) (9,521) (8,573)
Purchase of treasury stock                 (868) (1,675) 0
Net Cash Provided By Financing Activities                 66,411 24,901 595
Net increase (decrease) in cash                 (677) (1,705) (2,248)
Cash and Cash Equivalents, Beginning       27,928       29,633 27,928 29,633 31,881
Cash and Cash Equivalents, Ending 27,261       27,928       27,261 27,928 29,633
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 22,197 23,074 16,679
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed net income of bank subsidiary                 (11,889) (12,327) (14,080)
Equity in undistributed (net income) loss of non-bank subsidiaries                 (585) (949) 5,135
Net unrealized (gains) losses on trading securities                 (11) 1 (47)
Decrease (increase) in other assets                 9 (13) 112
Increase in other liabilities                 663 601 384
Net cash provided by operating activities                 10,384 10,387 8,183
Cash flows from investing activities                 0 0 0
Cash Flows From Financing Activities:                      
Dividends paid                 (9,515) (9,521) (8,573)
Purchase of treasury stock                 (868) (1,675) 0
Net proceeds from sale of treasury stock and option exercises                 0 587 739
Net advance to subsidiary                 0 0 (600)
Net Cash Provided By Financing Activities                 (10,383) (10,609) (8,434)
Net increase (decrease) in cash                 1 (222) (251)
Cash and Cash Equivalents, Beginning       $ 1,556       $ 1,778 1,556 1,778 2,029
Cash and Cash Equivalents, Ending $ 1,557       $ 1,556       $ 1,557 $ 1,556 $ 1,778