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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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 | $ 982,461 | $ 914,972
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 18.19% | 18.23%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 432,081 | $ 401,532
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 914,937 | $ 852,189
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 16.94% | 16.98%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 324,061 | $ 301,149
Common equity Tier I capital ratio, Actual, Amount | $ 890,118 | $ 827,547
Common equity Tier I capital ratio, Actual, Ratio | 16.48% | 16.49%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 243,046 | $ 225,861
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 914,937 | $ 852,189
Tier 1 Capital (to Average-Assets), Actual, Ratio | 11.49% | 11.22%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 318,552 | $ 303,794
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk-Weighted Assets), Actual, Amount | $ 971,681 | $ 905,563
Total Capital (to Risk-Weighted Assets), Actual, Ratio | 18.01% | 18.06%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 431,576 | $ 401,053
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 539,471 | 501,316
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount | $ 904,236 | $ 842,854
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio | 16.76% | 16.81%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount | $ 323,682 | $ 300,790
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount | 431,576 | 401,053
Common equity Tier I capital ratio, Actual, Amount | $ 904,236 | $ 842,854
Common equity Tier I capital ratio, Actual, Ratio | 16.76% | 16.81%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount | $ 242,762 | $ 225,592
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount | 350,656 | 325,856
Tier 1 Capital (to Average-Assets), Actual, Amount | $ 904,236 | $ 842,854
Tier 1 Capital (to Average-Assets), Actual, Ratio | 11.36% | 11.11%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount | $ 318,305 | $ 303,527
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount | $ 397,882 | $ 379,409
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=35709795&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=35709795&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 minimum Total risk based capital ratio (total 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=35709795&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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&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 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: 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=35709795&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=35709795&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=35709795&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=35709795&loc=d3e65071-112826 + Details
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