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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