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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Carrying Amount | $ 117,662 | $ 62,135
Cash and cash equivalents, Estimated Fair Value | 117,662 | 62,135
Debt securities, available for sale | 676,422 | 663,294
Debt securities, available for sale, Estimated Fair Value | 676,422 | 663,294
Equity securities, carrying amount | 1,720 | 1,718
Equity securities, Estimated Fair Value | 1,720 | 1,718
Loans held for sale, Carrying Amount | 1,602 | 1,507
Loans held for sale, Estimated Fair Value | 1,602 | 1,507
Loans and leases receivable, net of allowance for loan and lease losses, Carrying Amount | 8,700,565 | 8,503,522
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value | 8,774,518 | 8,481,128
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount | 80,416 | 89,685
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 80,416 | 89,685
Derivative assets | 14,665 | 14,693
Deposits, Carrying Amount | 7,425,318 | 7,142,236
Deposits, Estimated Fair Value | 7,422,232 | 7,136,009
Federal funds purchased, Carrying Amount | 388,000 | 187,000
Federal funds purchased, Estimated Fair Value | 388,000 | 187,000
FHLB advances, Carrying Amount | 1,025,832 | 1,248,070
FHLB advances, Estimated Fair Value | 1,025,830 | 1,248,046
Other borrowings, Carrying Amount | 123,963 | 123,871
Other borrowings, Estimated Fair Value | 123,591 | 121,718
Subordinated debt, Carrying Amount | 109,002 | 108,977
Subordinated debt, Estimated Fair Value | 113,988 | 110,550
Derivative liabilities | 23,837 | 16,286
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Estimated Fair Value | 117,662 | 62,135
Debt securities, available for sale, Estimated Fair Value | 0 | 0
Equity securities, Estimated Fair Value | 1,720 | 1,718
Loans held for sale, Estimated Fair Value | 0 | 0
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value | 0 | 0
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0
Derivative assets | 0 | 0
Deposits, Estimated Fair Value | 5,867,017 | 5,408,055
Federal funds purchased, Estimated Fair Value | 388,000 | 187,000
FHLB advances, Estimated Fair Value | 500,832 | 998,070
Other borrowings, Estimated Fair Value | 0 | 0
Subordinated debt, Estimated Fair Value | 0 | 0
Derivative liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0
Debt securities, available for sale, Estimated Fair Value | 676,422 | 663,294
Equity securities, Estimated Fair Value | 0 | 0
Loans held for sale, Estimated Fair Value | 1,602 | 1,507
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value | 1,480,195 | 1,405,420
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 80,416 | 89,685
Derivative assets | 14,588 | 14,624
Deposits, Estimated Fair Value | 1,555,215 | 1,727,954
Federal funds purchased, Estimated Fair Value | 0 | 0
FHLB advances, Estimated Fair Value | 524,998 | 249,976
Other borrowings, Estimated Fair Value | 123,591 | 121,718
Subordinated debt, Estimated Fair Value | 113,988 | 110,550
Derivative liabilities | 23,837 | 16,286
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0
Debt securities, available for sale, Estimated Fair Value | 0 | 0
Equity securities, Estimated Fair Value | 0 | 0
Loans held for sale, Estimated Fair Value | 0 | 0
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value | 7,294,323 | 7,075,708
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0
Derivative assets | 77 | 69
Deposits, Estimated Fair Value | 0 | 0
Federal funds purchased, Estimated Fair Value | 0 | 0
FHLB advances, Estimated Fair Value | 0 | 0
Other borrowings, Estimated Fair Value | 0 | 0
Subordinated debt, Estimated Fair Value | 0 | 0
Derivative liabilities | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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