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Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Assets |  |
Cash and due from banks | $ 244,333 | $ 169,186
Equity securities | 11,644 | 11,737
Available-for-sale debt securities | 2,209,199 | 2,114,129
Held-to-maturity debt securities | 852,824 | 1,020,934
Net loans | 7,702,435 | 7,607,333
Loans held for sale | 20,715 | 8,994
Accrued interest receivable | 37,156 | 38,853
Financial Liabilities |  |
Deposits | 8,664,363 | 8,831,633
Federal Home Loan Bank borrowings | 1,161,092 | 1,054,174
Other borrowings | 325,247 | 290,522
Subordinated debt and junior subordinated debt | 156,632 | 189,842
Accrued interest payable | 5,273 | 4,627
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial Assets |  |
Cash and due from banks | 244,333 | 169,186
Equity securities | 11,644 | 11,737
Accrued interest receivable | 37,156 | 38,853
Financial Liabilities |  |
Deposits | 7,388,830 | 7,376,023
Other borrowings | 322,295 | 288,918
Accrued interest payable | 5,273 | 4,627
Significant Other Observable Inputs (Level 2) [Member] |  |
Financial Assets |  |
Available-for-sale debt securities | 2,207,565 | 2,112,626
Held-to-maturity debt securities | 877,258 | 120,195
Loans held for sale | 20,715 | 8,994
Other assets - interest rate derivatives | 18,672 | 4,650
Financial Liabilities |  |
Deposits | 1,282,416 | 1,460,367
Federal Home Loan Bank borrowings | 1,167,912 | 1,051,401
Other borrowings | 3,368 | 1,936
Subordinated debt and junior subordinated debt | 144,998 | 174,448
Other liabilities - interest rate derivatives | 20,721 | 5,081
Significant Unobservable Inputs (Level 3) [Member] |  |
Financial Assets |  |
Available-for-sale debt securities | 1,634 | 1,503
Held-to-maturity debt securities | 551 | 548
Net loans | 7,741,859 | 7,422,825
Carrying Amount [Member] |  |
Financial Assets |  |
Cash and due from banks | 244,333 | 169,186
Equity securities | 11,644 | 11,737
Available-for-sale debt securities | 2,209,199 | 2,114,129
Held-to-maturity debt securities | 852,824 | 1,020,934
Net loans | 7,702,435 | 7,607,333
Loans held for sale | 20,715 | 8,994
Other assets - interest rate derivatives | 18,672 | 4,650
Accrued interest receivable | 37,156 | 38,853
Financial Liabilities |  |
Deposits | 8,664,363 | 8,831,633
Federal Home Loan Bank borrowings | 1,161,092 | 1,054,174
Other borrowings | 325,247 | 290,522
Subordinated debt and junior subordinated debt | 156,632 | 189,842
Other liabilities - interest rate derivatives | 20,721 | 5,081
Accrued interest payable | 5,273 | 4,627
Fair Value Estimate [Member] |  |
Financial Assets |  |
Cash and due from banks | 244,333 | 169,186
Equity securities | 11,644 | 11,737
Available-for-sale debt securities | 2,209,199 | 2,114,129
Held-to-maturity debt securities | 877,809 | 120,743
Net loans | 7,741,859 | 7,422,825
Loans held for sale | 20,715 | 8,994
Other assets - interest rate derivatives | 18,672 | 4,650
Accrued interest receivable | 37,156 | 38,853
Financial Liabilities |  |
Deposits | 8,671,246 | 8,836,390
Federal Home Loan Bank borrowings | 1,167,912 | 1,051,401
Other borrowings | 325,663 | 290,854
Subordinated debt and junior subordinated debt | 144,998 | 174,448
Other liabilities - interest rate derivatives | 20,721 | 5,081
Accrued interest payable | $ 5,273 | $ 4,627

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + 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 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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: 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=118954083&loc=d3e26610-111562 Reference 3: 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=118939692&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=118932676&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=118951113&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 Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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