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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,039,060 | $ 982,461
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 18.01% | 18.19%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 461,574 | $ 432,081
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 973,169 | $ 914,937
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 16.87% | 16.94%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 346,180 | $ 324,061
Common equity Tier I capital ratio, Actual, Amount | $ 948,210 | $ 890,118
Common equity Tier I capital ratio, Actual, Ratio | 16.43% | 16.48%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 259,635 | $ 243,046
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 973,169 | $ 914,937
Tier 1 Capital (to Average-Assets), Actual, Ratio | 11.88% | 11.49%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 327,680 | $ 318,552
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 1,029,126 | $ 971,681
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 17.86% | 18.01%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 461,037 | $ 431,576
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 576,296 | 539,471
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 963,235 | $ 904,236
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 16.71% | 16.76%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 345,778 | $ 323,682
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 461,037 | 431,576
Common equity Tier I capital ratio, Actual, Amount | $ 963,235 | $ 904,236
Common equity Tier I capital ratio, Actual, Ratio | 16.71% | 16.76%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 259,333 | $ 242,762
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount | 374,592 | 350,656
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 963,235 | $ 904,236
Tier 1 Capital (to Average-Assets), Actual, Ratio | 11.77% | 11.36%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 327,397 | $ 318,305
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount | $ 409,246 | $ 397,882
Minimum [Member] | Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
Minimum [Member] | Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 10.00% | 10.00%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio | 8.00% | 8.00%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Ratio | 6.50% | 6.50%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio | 5.00% | 5.00%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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