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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets |  |  |  |
Total cash and cash equivalents | $ 121,633 | $ 106,097 | $ 105,768 | $ 94,693
Interest-earning balances due from depository institutions | 47,848 | 32,691 |  |
FHLB stock | 17,688 | 17,588 |  |
Investment securities available-for-sale | 2,270,466 | 2,368,646 |  |
Investment securities held-to-maturity | 911,676 | 850,989 |  |
Total loans, net of allowance for loan losses | 4,333,524 | 3,957,781 |  |
Swaps | 5,783 | 9,344 |  |
Deposits: |  |  |  |
Noninterest-bearing | 3,673,541 | 3,250,174 |  |
Interest-bearing | 2,636,139 | 2,667,086 |  |
Junior subordinated debentures | 25,774 | 25,774 |  |
Swaps | 608,811 | 700,048 |  |
Carrying Value [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 119,445 | 106,097 |  |
Interest-earning balances due from depository institutions | 2,188 | 32,691 |  |
FHLB stock | 17,688 | 17,588 |  |
Investment securities available-for-sale | 2,270,466 | 2,368,646 |  |
Investment securities held-to-maturity | 911,676 | 850,989 |  |
Total loans, net of allowance for loan losses | 4,333,524 | 3,957,781 |  |
Swaps | 5,783 | 9,344 |  |
Deposits: |  |  |  |
Noninterest-bearing | 3,673,541 | 3,250,174 |  |
Interest-bearing | 2,636,139 | 2,667,086 |  |
Borrowings | 656,028 | 736,704 |  |
Junior subordinated debentures | 25,774 | 25,774 |  |
Swaps | 5,783 | 9,344 |  |
Estimated Fair Value [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 119,445 | 106,097 |  |
Interest-earning balances due from depository institutions | 2,188 | 32,691 |  |
FHLB stock | 17,688 | 17,588 |  |
Investment securities available-for-sale | 2,270,466 | 2,368,646 |  |
Investment securities held-to-maturity | 897,374 | 853,039 |  |
Total loans, net of allowance for loan losses | 4,306,225 | 3,971,329 |  |
Swaps | 5,783 | 9,344 |  |
Deposits: |  |  |  |
Noninterest-bearing | 3,673,541 | 3,250,174 |  |
Interest-bearing | 2,634,443 | 2,666,186 |  |
Borrowings | 655,820 | 736,575 |  |
Junior subordinated debentures | 18,463 | 27,210 |  |
Swaps | 5,783 | 9,344 |  |
Estimated Fair Value [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 119,445 | 106,097 |  |
Interest-earning balances due from depository institutions | 0 | 0 |  |
FHLB stock | 0 | 0 |  |
Investment securities available-for-sale | 0 | 0 |  |
Investment securities held-to-maturity | 0 | 0 |  |
Total loans, net of allowance for loan losses | 0 | 0 |  |
Swaps | 0 | 0 |  |
Deposits: |  |  |  |
Noninterest-bearing | 3,673,541 | 3,250,174 |  |
Interest-bearing | 0 | 0 |  |
Borrowings | 0 | 0 |  |
Junior subordinated debentures | 0 | 0 |  |
Swaps | 0 | 0 |  |
Estimated Fair Value [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 0 | 0 |  |
Interest-earning balances due from depository institutions | 2,188 | 32,691 |  |
FHLB stock | 17,688 | 17,588 |  |
Investment securities available-for-sale | 2,270,466 | 2,368,646 |  |
Investment securities held-to-maturity | 897,374 | 851,186 |  |
Total loans, net of allowance for loan losses | 0 | 0 |  |
Swaps | 5,783 | 9,344 |  |
Deposits: |  |  |  |
Noninterest-bearing | 0 | 0 |  |
Interest-bearing | 2,634,443 | 2,666,186 |  |
Borrowings | 655,820 | 736,575 |  |
Junior subordinated debentures | 0 | 0 |  |
Swaps | 5,783 | 9,344 |  |
Estimated Fair Value [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 0 | 0 |  |
Interest-earning balances due from depository institutions | 0 | 0 |  |
FHLB stock | 0 | 0 |  |
Investment securities available-for-sale | 0 | 0 |  |
Investment securities held-to-maturity | 0 | 1,853 |  |
Total loans, net of allowance for loan losses | 4,306,225 | 3,971,329 |  |
Swaps | 0 | 0 |  |
Deposits: |  |  |  |
Noninterest-bearing | 0 | 0 |  |
Interest-bearing | 0 | 0 |  |
Borrowings | 0 | 0 |  |
Junior subordinated debentures | 18,463 | 27,210 |  |
Swaps | $ 0 | $ 0 |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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