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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]
Alternative Investment		$ 26,400	$ 16,700
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Valuation allowance of impaired loans		4,000	2,200
Other Liabilities
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period		0	0
Total realized gains included in income		0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Purchases		0	0
Issuances		0	0
Settlements		0	0
Transfers out of Level 3		0	0
Fair value, December 31		0	0
Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities		30,300	30,445
U.S. government agency securities		70,159	180,801
Mortgage-backed securities		1,310,945	1,263,819
State and municipal securities		1,229,654	784,612
Asset-Backed Securities, at Carrying Value		375,582	173,292
Corporate notes and other		67,046	82,314
Total investment securities available-for-sale		3,083,686	2,515,283
Alternative Investment		50,791	53,796
Other assets		24,524	11,812
Total assets at fair value		3,159,001	2,580,891
Liabilities at fair value [Abstract]
Other liabilities		46,550	13,886
Total liabilities at fair value		46,550	13,886
Fair Value, Measurements, Recurring | Quoted Market Prices in an Active Market (Level 1)
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities		0	0
U.S. government agency securities		0	0
Mortgage-backed securities		0	0
State and municipal securities		0	0
Asset-Backed Securities, at Carrying Value			0
Agency backed securities, Fair Value Disclosure		0
Corporate notes and other		0	0
Total investment securities available-for-sale		0	0
Alternative Investment		0	0
Other assets		0	0
Total assets at fair value		0	0
Liabilities at fair value [Abstract]
Other liabilities		0	0
Total liabilities at fair value		0	0
Fair Value, Measurements, Recurring | Models with Significant Observable Market Parameters (Level 2)
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities		30,300	30,445
U.S. government agency securities		70,159	180,801
Mortgage-backed securities		1,310,945	1,263,819
State and municipal securities		1,215,059	767,583
Asset-Backed Securities, at Carrying Value		375,582	173,292
Corporate notes and other		67,046	82,314
Total investment securities available-for-sale		3,069,091	2,498,254
Alternative Investment		24,369	24,922
Other assets		24,524	11,812
Total assets at fair value		3,117,984	2,534,988
Liabilities at fair value [Abstract]
Other liabilities		46,550	13,886
Total liabilities at fair value		46,550	13,886
Fair Value, Measurements, Recurring | Models with Significant Unobservable Market Parameters (Level 3)
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities		0	0
U.S. government agency securities		0	0
Mortgage-backed securities		0	0
State and municipal securities		14,595	17,029
Asset-Backed Securities, at Carrying Value			0
Agency backed securities, Fair Value Disclosure		0
Corporate notes and other		0	0
Total investment securities available-for-sale		14,595	17,029
Alternative Investment		26,422	28,874
Other assets		0	0
Total assets at fair value		41,017	45,903
Liabilities at fair value [Abstract]
Other liabilities		0	0
Total liabilities at fair value		0	0
Fair Value, Measurements, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		55,995	50,554
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned		15,165	27,831
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[1]	40,830	22,723
Total losses on other real estate owned		84	(203)
Total losses on collateral dependent nonaccrual loans, net	[1]	(1,214)	(4)
Total losses		(1,298)	199
Fair Value, Measurements, Nonrecurring | Quoted Market Prices in an Active Market (Level 1)
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		0	0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned		0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[1]	0	0
Fair Value, Measurements, Nonrecurring | Models with Significant Observable Market Parameters (Level 2)
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		0	0
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned		0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[1]	0	0
Fair Value, Measurements, Nonrecurring | Models with Significant Unobservable Market Parameters (Level 3)
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		55,995	50,554
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned		15,165	27,831
Impaired Financing Receivable, with Related Allowance, Recorded Investment	[1]	40,830	22,723
Other Assets
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period		28,874	10,478
Total realized gains included in income		2,932	605
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0	0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Acquired		0	17,062
Purchases		9,013	2,330
Issuances		0	0
Settlements		(2,231)	(1,601)
Transfers out of Level 3		(12,166)	0
Fair value, December 31		26,422	28,874
Available-for-sale Securities
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period		17,029	0
Total realized gains included in income		34	66
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		(1,300)	709
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Acquired		0	16,254
Purchases		0	0
Issuances		0	0
Settlements		(1,168)	0
Transfers out of Level 3		0	0
Fair value, December 31		$ 14,595	$ 17,029
[1] Amount is net of a valuation allowance of $4.0 million and $2.2 million at December 31, 2018 and 2017, respectively, as required by ASC 310-10, "Receivables."

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