Securities - Summary of Investment Securities by Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Total, Fair value	$ 540,045	$ 380,490
US Treasury Securities
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Within one year, Amortized cost	4,988
Amortized Cost	4,988	4,969
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Within one year, Fair value	5,015
Total, Fair value	5,015	4,966
US government agencies
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Within one year, Amortized cost	7,008
One to five years, Amortized cost	12,520
Five to ten years, Amortized cost	2,916
Amortized Cost	22,444	31,121
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Within one year, Fair value	7,052
One to five years, Fair value	12,673
Five to ten years, Fair value	3,054
Total, Fair value	22,779	30,944
Mortgage-backed securities
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
One to five years, Amortized cost	5,030
Five to ten years, Amortized cost	152,561
After 10 years, Amortized cost	331,103
Amortized Cost	488,694	345,606
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
One to five years, Fair value	5,131
Five to ten years, Fair value	159,082
After 10 years, Fair value	339,084
Total, Fair value	503,297	343,581
Excluding Mutual Fund
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Amortized Cost	524,619
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Total, Fair value	540,045
Municipal bonds
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
After 10 years, Amortized cost	8,493
Amortized Cost	8,493	1,000
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
After 10 years, Fair value	8,954
Total, Fair value	$ 8,954	$ 999

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: 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

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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
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-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

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