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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Total cash and cash equivalents | $ 137,196 | $ 119,445
Interest-earning balances due from depository institutions | 20,521 | 47,848
FHLB stock | 17,688 | 17,688
Investment securities available-for-sale | 2,175,648 | 2,270,466
Investment securities held-to-maturity | 848,382 | 911,676
Total loans, net of allowance for loan losses | 4,685,793 | 4,333,524
Deposits: |  |
Noninterest-bearing | 3,908,809 | 3,673,541
Interest-bearing | 2,699,287 | 2,636,139
Junior subordinated debentures | 25,774 | 25,774
Swaps | 459,888 | 608,811
Carrying Value [Member] |  |
Assets |  |
Total cash and cash equivalents | 143,790 | 119,445
Interest-earning balances due from depository institutions | 20,521 | 2,188
FHLB stock | 17,688 | 17,688
Investment securities available-for-sale | 2,175,648 | 2,270,466
Investment securities held-to-maturity | 848,382 | 911,676
Total loans, net of allowance for loan losses | 4,685,793 | 4,333,524
Swaps | 4,819 | 5,783
Deposits: |  |
Noninterest-bearing | 3,908,809 | 3,673,541
Interest-bearing | 2,699,287 | 2,636,139
Borrowings | 518,069 | 656,028
Junior subordinated debentures | 25,774 | 25,774
Swaps | 4,819 | 5,783
Estimated Fair Value [Member] |  |
Assets |  |
Total cash and cash equivalents | 143,790 | 119,445
Interest-earning balances due from depository institutions | 20,567 | 2,188
FHLB stock | 17,688 | 17,688
Investment securities available-for-sale | 2,175,648 | 2,270,466
Investment securities held-to-maturity | 842,050 | 897,374
Total loans, net of allowance for loan losses | 4,619,896 | 4,306,225
Swaps | 4,819 | 5,783
Deposits: |  |
Noninterest-bearing | 3,908,809 | 3,673,541
Interest-bearing | 2,697,349 | 2,634,443
Borrowings | 517,827 | 655,820
Junior subordinated debentures | 18,260 | 18,463
Swaps | 4,819 | 5,783
Estimated Fair Value [Member] | Level 1 [Member] |  |
Assets |  |
Total cash and cash equivalents | 143,790 | 119,445
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 | 3,908,809 | 3,673,541
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 | 20,567 | 2,188
FHLB stock | 17,688 | 17,688
Investment securities available-for-sale | 2,175,648 | 2,270,466
Investment securities held-to-maturity | 842,050 | 897,374
Total loans, net of allowance for loan losses | 0 | 0
Swaps | 4,819 | 5,783
Deposits: |  |
Noninterest-bearing | 0 | 0
Interest-bearing | 2,697,349 | 2,634,443
Borrowings | 517,827 | 655,820
Junior subordinated debentures | 0 | 0
Swaps | 4,819 | 5,783
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 | 0
Total loans, net of allowance for loan losses | 4,619,896 | 4,306,225
Swaps | 0 | 0
Deposits: |  |
Noninterest-bearing | 0 | 0
Interest-bearing | 0 | 0
Borrowings | 0 | 0
Junior subordinated debentures | 18,260 | 18,463
Swaps | $ 0 | $ 0

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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: 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(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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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