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Investment Securities, Part II (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) securities	Dec. 31, 2018 USD ($) securities	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 60,900,000	$ 13,152,000	$ 159,663,000
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	131,172,000
After 1 through 5 years	377,027,000
After 5 through 10 years	176,417,000
After ten years	1,432,000
Fair Value	$ 686,048,000	692,274,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths)	2.70%
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths)	2.88%
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths)	2.81%
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths)	3.07%
Available-for-sale , Weighted Average Yield, Maturities (in hundredths)	2.83%
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths)	2.94%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths)	3.08%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths)	3.32%
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths)	4.08%
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths)	3.12%
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 64,511,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	5,031,000
Held-to-maturity, at amortized cost (estimated fair value of $69,572 and $67,909 at December 31, 2019 and 2018, respectively)	$ 69,542,000	$ 69,436,000
Held To Maturity Weighted Average Yield Maturities Year One	1.89%
Held To Maturity Weighted Average Yield Maturities After 1 Through 5 Years	2.06%
Held To Maturity Weighted Average Yield Maturities After 5 Through 10 Years	0.00%
Held To Maturity Weighted Average Yield Maturities After 10 Years	0.00%
Held To Maturity Weighted Average Yield Maturities	1.90%
Held To Maturity Tax Equivalent Yield Maturities Year One	1.89%
Held To Maturity Tax Equivalent Yield Maturities After 1 Through 5 Years	2.06%
Held To Maturity Tax Equivalent Yield Maturities After 5 Through 10 Years	0.00%
Held To Maturity Tax Equivalent Yield Maturities After 10 Years	0.00%
Held To Maturity Tax Equivalent Yield Maturities	1.90%
Tax rate used to calculate tax-equivalent yields (in hundredths)	21.00%	35.00%
Percentage investment book value exceeds total stockholders' equity (in hundredths)	10.00%
Available-for-sale Securities, Restricted	$ 688,000,000	$ 628,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	93,924,000	136,312,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(398,000)	(1,748,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	21,235,000	319,611,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(191,000)	(9,513,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	115,159,000	455,923,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(589,000)	(11,261,000)
Credit losses on trust preferred securities held [Abstract]
Beginning of period	0	1,111,000	1,111,000
Additions related to OTTI losses not previously recognized	0	0	0
Reductions due to sales / (recoveries)	0	(1,111,000)	0
Reductions due to change in intent or likelihood of sale	0	0	0
Additions related to increases in previously recognized OTTI losses	0	0	0
Reductions due to increases in expected cash flows	0	0	0
End of period	0	0	1,111,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	64,501,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	5,071,000
Debt Securities, Held-to-maturity, Fair Value	69,572,000	67,909,000
Available-for-sale Securities, Amortized Cost Basis	674,223,000	701,225,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	12,414,000	2,310,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	589,000	11,261,000
Available-for-sale Securities, Gross Realized Gains	875,000	941,000	773,000
Available-for-sale Securities, Gross Realized Losses	(73,000)	(40,000)	(157,000)
Available-for-sale Securities, Income Tax Expense	233,000	261,000	$ 216,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	97,088,000
After 1 through 5 years	10,232,000
After 5 through 10 years	0
After ten years	0
Fair Value	107,320,000	198,649,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	64,511,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	5,031,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	0
Held-to-maturity, at amortized cost (estimated fair value of $69,572 and $67,909 at December 31, 2019 and 2018, respectively)	69,542,000	69,436,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	23,375,000	16,095,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(60,000)	(148,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	105,549,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(3,087,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	23,375,000	121,644,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(60,000)	$ (3,235,000)
Number of AFS securities in Unrealized Loss Positions | securities		23
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	14,996,000	$ 19,683,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(25,000)	(147,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	24,565,000	48,226,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(44,000)	(1,380,000)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	39,561,000	67,909,000
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (69,000)	$ (1,527,000)
Number of HTM securities in Unrealized Loss Positions | securities	4	9
Credit losses on trust preferred securities held [Abstract]
Debt Securities, Held-to-maturity, Fair Value	$ 69,572,000	$ 67,909,000
Available-for-sale Securities, Amortized Cost Basis	106,428,000	201,380,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	952,000	504,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	60,000	3,235,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	99,000	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	69,000	1,527,000
Obligations of states and political subdivisions
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	30,565,000
After 1 through 5 years	68,896,000
After 5 through 10 years	77,953,000
After ten years	1,019,000
Fair Value	178,433,000	192,579,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,469,000	38,782,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(16,000)	(450,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	347,000	42,741,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,000)	(1,390,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,816,000	81,523,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (17,000)	(1,840,000)
Number of AFS securities in Unrealized Loss Positions | securities	1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(84)
Credit losses on trust preferred securities held [Abstract]
Available-for-sale Securities, Amortized Cost Basis	$ 172,460,000	193,195,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	5,990,000	1,224,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	17,000	1,840,000
Mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	1,517,000
After 1 through 5 years	296,145,000
After 5 through 10 years	98,464,000
After ten years	0
Fair Value	396,126,000	298,672,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	67,080,000	81,435,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(322,000)	(1,150,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	20,888,000	171,321,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(190,000)	(5,036,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	87,968,000	252,756,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (512,000)	$ (6,186,000)
Number of AFS securities in Unrealized Loss Positions | securities	14	69
Credit losses on trust preferred securities held [Abstract]
Available-for-sale Securities, Amortized Cost Basis	$ 391,307,000	$ 304,372,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	5,331,000	486,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	512,000	6,186,000
Other securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	2,002,000
After 1 through 5 years	1,754,000
After 5 through 10 years	0
After ten years	413,000
Fair Value	4,169,000	2,374,000
Credit losses on trust preferred securities held [Abstract]
Available-for-sale Securities, Amortized Cost Basis	4,028,000	2,278,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	141,000	96,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ 0	$ 0

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after five through ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities after ten years.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities after one through five years.

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